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GB2539955A - Process for producing liquefied natural gas - Google Patents

Process for producing liquefied natural gas Download PDF

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Publication number
GB2539955A
GB2539955A GB1511673.4A GB201511673A GB2539955A GB 2539955 A GB2539955 A GB 2539955A GB 201511673 A GB201511673 A GB 201511673A GB 2539955 A GB2539955 A GB 2539955A
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GB
United Kingdom
Prior art keywords
gas
pressure
feed
natural gas
recycle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1511673.4A
Other versions
GB201511673D0 (en
Inventor
Frederick Skinner Geoffrey
Dwight Maunder Anthony
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gasconsult Ltd
Original Assignee
Gasconsult Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gasconsult Ltd filed Critical Gasconsult Ltd
Priority to GB1511673.4A priority Critical patent/GB2539955A/en
Publication of GB201511673D0 publication Critical patent/GB201511673D0/en
Priority to PCT/GB2016/000128 priority patent/WO2017006074A1/en
Publication of GB2539955A publication Critical patent/GB2539955A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F25J1/0254—Operation; Control and regulation; Instrumentation controlling particular process parameter, e.g. pressure, temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

In a process for producing liquefied natural gas a feed natural gas 1 is mixed with methane-rich recycle gas 6 and introduced into a liquefaction unit (A) such that a partially liquefied stream emerges at reduced pressure. Separation of the said two-phase stream into liquid and vapour fractions provides a liquefied natural gas and methane vapour which constitutes the said recycle gas. The feed natural gas and the recycle gas are mixed at substantially the same pressure. The resulting mixed stream are compressed to a higher pressure before being introduced into the liquefaction unit.

Description

Description
Process for Producing Liquefied Natural Gas Field of the Invention
This invention relates to a process for the production of liquefied natural gas (LNG).
Background
It is known that the pressure of the feed natural gas has a significant influence on the refrigeration energy needed to produce liquefied natural gas. The lower the pressure of the feed gas, the lower the temperature range of the condensation process, and as a result the higher the power requirement of the refrigeration cycle.
Accordingly, in cases of low feed natural gas pressure, one can consider compressing the feed gas upstream of the liquefaction plant, as the saving in power in the liquefaction unit can more than offset the additional power needed for said feed compression.
Although such pre-compression of the feed can give an attractive energy saving, there is the complication and expense of providing an additional compressor. Furthermore, the pre-compressor operates on a different fluid (natural gas) from the higher hydrocarbon refrigerants commonly used in the main liquefaction cycle.
Summary of the Invention
The invention concerns methane expander type LNG production processes.
According to the present invention there is provided a process for producing liquefied natural gas in which a feed natural gas is mixed with a methane-rich recycle gas and introduced into a liquefaction unit such that a product stream emerges at reduced pressure as a two-phase stream; the two-phase stream flows to a separator in which the liquid and vapour fractions are separated to form liquid natural gas and methane vapour which, after reheating and compression as necessary, constitutes the said recycle gas, wherein: the feed natural gas has a pressure between the pressure of the recycle gas in the said separator and 80 bar; the feed gas and recycle gas are mixed at substantially the same pressure and the resulting combined stream is compressed to a pressure of from 40 to 120 bar before being introduced into the said liquefaction unit
The invention consists of introducing the feed gas, particularly natural gas, at pressures particularly below 50 bar into the compression train at a point at which the pressure of the gas being compressed is essentially equal to the pressure of the feed gas. The exact point of introduction of the feed gas depends upon the pressure of the feed gas and the pressure of the recycle gas. Thus, the two gas streams may be mixed before compression or the feed gas may be introduced to the recycle gas part way during the compression of the recycle gas. The pressure at the end of the compression train and the resulting pressure of recycle to the liquefaction step can then be selected independently of the pressure of the feed natural gas, and can be as high as is convenient - typically 60 bar or higher - so as to minimise the total power requirement of the liquefaction process.
By application of the invention, the energy demand of an LNG production process may be reduced over a wide range of feed gas pressures without the complication of an additional feed gas compressor.
Suitable types of liquefaction processes are well known in the art. Conveniently, cryogenic refrigeration is achieved by work expansion of the methane-rich gas in one or more expanders.
Certain types of feed natural gas contain heavier components (C3+), which typically are removed by cooling the feed. This is more difficult to achieve, once the feed has been mixed with the recycle. In these cases, it is therefore advantageous to precool and condense the heavies and then reheat the remaining feed by heat exchange with the liquefaction process.
Description of Preferred Embodiments
Reference is made to the accompanying drawings in which:
Figure 1 represents a schematic diagram of a known open loop methane cycle process for the liquefaction of methane;
Figure 2 represents a schematic diagram of a known modification of the process illustrated in Figure 1;
Figure 3 represents a schematic diagram of a process in accordance with the invention, and
Figure 4 represents a graph illustrating the compression power saving for a process of the invention compared to a known process.
Referring to Figure 1 the feed natural gas after removal of acid gas components and water vapour enters (1) at a pressure typically between 20 and 80 bar. The feed gas (1) is mixed with a methane-rich recycle gas stream (8). The combined stream (2) at near-ambient temperature enters the liquefaction unit (A) in which it is partially liquefied, emerging at reduced pressure as a two-phase stream (3).
The internal design of the liquefaction unit (A) is known and there are several different constructions in the prior art. The precise configuration of the liquefaction unit is not relevant to the invention.
The two-phase stream (3) flows to a separator (B), in which the liquid and vapour fractions are separated. The liquid fraction (4) is typically let down in pressure to near atmospheric pressure to form LNG product.
The vapour fraction (5) is recycled and reheated to near-ambient temperature and the resulting stream (6) s then compressed to slightly above the pressure of the feed gas (7) in compressor C. The compressed recycle stream is cooled to near-ambient temperature (8) in cooler (D) and then rejoins the feed gas.
It will be understood that the compressor (C) typically will comprise at least two stages with intercooling.
Figure 2 shows a modification of the process described with reference to Figure 1 and is advantageous when the feed gas is available at a pressure below 50 bar.
The modification comprises compression of the feed gas (1) in an additional compressor (E) such that the compressed feed gas (11) is mixed with the recycle gas stream (8) and the combined stream (2) enters the liquefaction unit (A) at a pressure typically in the range 40 to 80 bar.
When the feed gas 1 has a pressure much below 50 bar the combined power of the two compressors (C and E) is significantly below the power of compressor (C) in Figure 1. However, the said saving in compression power may be insufficient to outweigh the extra investment and complication of providing the additional compressor E.
Figure 3 illustrates a process of the invention, whereby the compression of lower pressure feed gas, typically below 50 bar, is performed by admitting the feed gas to a point in the compressor (C) at which the pressure of the gas being compressed is essentially equal to the pressure of the feed gas.
If the pressure of the feed gas is as low as the pressure of the recycle gas at (6), the feed gas may be mixed with the recycle gas and admitted to the suction of compressor (C) at that point (la).
In the more typical case of the pressure of the feed gas being higher than the pressure of the recycle gas (6), the feed gas may be admitted (1b) at an intermediate stage in the compressor (C) where the recycle gas is at approximately the same pressure as the feed gas e.g. through a separate suction (nozzle) or at an intercooler, some adjustment of the local inter-stage pressure being carried out if necessary to avoid wasteful loss of pressure.
The pressure of the combined stream (2) at the outlet of compressor (C) is generally in the range 40 to 120 bar, more typically 50 to 100 bar.
This arrangement achieves the same energy saving as the additional compressor (E) in Figure 2, without the complication of providing a separate feed gas compressor. Taking into account also the reduction in total power demand resulting from boosting the feed gas pressure, the investment cost in gas compression shown in Figure 3 is lower than for Figure 1 and Figure 2.
Figure 4 illustrates the potential saving in compression power that can be achieved with internal compression of feed gas in accordance with the invention, compared with a prior art process.
Curve A in Figure 4 illustrates the expected percentage increase in liquefaction power requirement (kWh/t LNG) with feed gas pressures from 50 bar down to 20 bar for a particular configuration of the liquefaction unit according to prior art as shown in Figure 1, with a feed gas temperature of + 40 degC. Curve B corresponds with Curve A with a feed gas temperature of -40 degC.
Curve C illustrates the smaller increase in liquefaction power requirement (kWh/t LNG) for the same feed gas pressure range but with feed gas compression according to the invention as shown in Figure 3, and with a feed gas temperature of + 40 degC. Curve D corresponds with Curve C with a feed gas temperature of - 40 degC.

Claims (1)

  1. Claims 1 A process for producing liquefied natural gas in which a feed natural gas is mixed with methane-rich recycle gas and introduced into a liquefaction unit such that a partially liquefied stream emerges at reduced pressure as a two-phase stream which flows to a separator in which the liquid and vapour fractions are separated to form liquid natural gas and methane vapour which constitutes a recycle gas, wherein: the feed natural gas has a pressure of from 20 to 80 bar; the feed gas and recycle gas are mixed at substantially the same pressure and the resulting combined stream is compressed to a pressure of from 40 to 120 bar before being introduced into the liquefaction unit. 2 A process according to Claim 1 in which the mixture of feed gas and recycle gas is compressed to a pressure in the range of 50 to 100 bar. 3 A process according to Claim 1 or Claim 2 in which the recycle gas is compressed prior to mixing with the feed gas. 4 A process according to any preceding Claim in which the pressure of the feed gas is less than 50 bar. 5 A process as claimed in any preceding claim in which cryogenic refrigeration is achieved in the liquefaction unit by work expansion of the methane-rich gas in one or more expanders. 6 A process as claimed in any preceding claim in which the feed gas is precooled to condense heavy components and is then reheated, by heat exchange with the liquefaction process.
GB1511673.4A 2015-07-03 2015-07-03 Process for producing liquefied natural gas Withdrawn GB2539955A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1511673.4A GB2539955A (en) 2015-07-03 2015-07-03 Process for producing liquefied natural gas
PCT/GB2016/000128 WO2017006074A1 (en) 2015-07-03 2016-06-23 Process for producing liquefied natural gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1511673.4A GB2539955A (en) 2015-07-03 2015-07-03 Process for producing liquefied natural gas

Publications (2)

Publication Number Publication Date
GB201511673D0 GB201511673D0 (en) 2015-08-19
GB2539955A true GB2539955A (en) 2017-01-04

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GB1511673.4A Withdrawn GB2539955A (en) 2015-07-03 2015-07-03 Process for producing liquefied natural gas

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WO (1) WO2017006074A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107560317A (en) * 2016-06-30 2018-01-09 通用电气公司 System and method for producing liquefied natural gas
TWI746977B (en) * 2019-01-22 2021-11-21 法商液態空氣喬治斯克勞帝方法研究開發股份有限公司 Gas liquefaction method and gas liquefaction device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2344640A (en) * 1997-06-20 2000-06-14 Exxon Production Research Co Improved process for liquefaction of natural gas
WO2009124925A2 (en) * 2008-04-09 2009-10-15 Shell Internationale Research Maatschappij B.V. Method and apparatus for liquefying a hydrocarbon stream
GB2522421A (en) * 2014-01-22 2015-07-29 Anthony Dwight Maunder LNG production process

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394187B1 (en) * 1989-04-17 1992-07-15 GebràœDer Sulzer Aktiengesellschaft Method for the recovery of nlg
US8555672B2 (en) * 2009-10-22 2013-10-15 Battelle Energy Alliance, Llc Complete liquefaction methods and apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2344640A (en) * 1997-06-20 2000-06-14 Exxon Production Research Co Improved process for liquefaction of natural gas
WO2009124925A2 (en) * 2008-04-09 2009-10-15 Shell Internationale Research Maatschappij B.V. Method and apparatus for liquefying a hydrocarbon stream
GB2522421A (en) * 2014-01-22 2015-07-29 Anthony Dwight Maunder LNG production process

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Publication number Publication date
WO2017006074A1 (en) 2017-01-12
GB201511673D0 (en) 2015-08-19

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