GB2036785A - Utilizing Pyrolysis Oil from a Scrap-Rubber Pyrolysis - Google Patents

Abstract

The oil resulting from scrap-rubber pyrolysis, and boiling above 160 DEG C, is added to bituminous compounds. The boiling point must be above the manufacturing temperature of bitumen, which fluctuates between 160 DEG C and 200 DEG C. Other synthetic materials (e.g. styrene-butadiene copolymer) may be dissolved in the oil before mixing it with bituminous compounds.

Description

SPECIFICATION Process for Utilizing Pyrolysis Oil From a Scrap-rubber Pyrolysis, especially of Scrap-tires Object of the invention is a bituminous mass, in case containing synthetic material and a process of its manufacture. The winning of the pyrolysis oil used in the bituminous mass was carried out by means of dry distillation at a temperature of 4000C--8000C, which is comperable to the processes described, for example, in DT-OS 25 20 774 or DT-AS 2404 800.

According to the present state of technology only suggestions had been made to utilize pyrolysis oil as a crude oil substitute or fractionated in light and heavy oil (IT-PS 3 28 776), as fuel or for heating purposes (DE-PS 635 098). The utilizing possibilities are, however, unsatisfactory since the pyrolysis oils contain too high a content of sulphur according to the present regulations and are also adulterated by other substances (for example 02, N2). This especially concerns the higher boiling portions of the pyrolysis oil. Furthermore, there is a risk of gumming-up since the oils are highly unsaturated.

All these disadvantages can only be remedied by means of expensive refining. It is true, that with this process, low boiling portions of pyroloysis oil can be regenerated to various products of greater value (solvents, resin raw materials etc.). However, for the higher boiling portions, according to the present state of technology, such a regeneration to products of higher value has hitherto been unknown (GB-PS 1 471 038).

Thus the problem arises of applying a fraction gained via the scrap-rubber pyrolysis, to a new purposes, and which should boil preferably above 1600C.

The solution to the problem consists in a bituminous mass in case containing synthetic material, characterized by a content of pyrolysis oil fraction from scrap-rubber and boiling above 1 600C. In any case, the boiling point of the pyrolysis oil fraction must be above the manufacturing temperature of the bitumen, which fluctuates between 1 6000 and 2000C depending on the kind of bitumen and additives utilized, in order to prevent a distilling-off of low-boiling portions.

The bituminous mass containing synthetic material is produced by imbibing or dissolving synthetic materials in a pyrolyses oil fraction boiling above 1 6000 gained from scrap-rubber before mixing it with the bituminous compound.

The pyrolysis oil (from scrap-tires) used in Example 1-4 was carried out by distillation at a temperature of 4000C--8000C in absence of oxygen and a slow rise of temperature. The oil is characterized as follows: Fraction lodine test Fraction boiling (acc. to boiling above 200 OC Hants) above 1600C Density at 200C 0.94 g/cm3 0.2 g of Oil 0.93 g/cm3 Content of sul- 1.32% duration:1h 1.24% phur (acc. to Schoeninger) Boiling-progress: % % 1600C--1800C - 95 9.8 1800C--2000C - 86 9.9 2000C--2250C 6.0 86 4.8 2250C--2500C 11.4 75 9.2 2500C--3000C 12.4 56 9.9 300 C350 C 31.6 55 25.3 3500C--3800C 31.6 48 25.3 rest 7.1 5.7 The utilization of this fraction has decisive advantages for processing bituminous compounds such as for example roof and sealing widths sound and heat-insulating boards, permanently elastic joint sealing and putty compounds, bitumen plastic widths, plastic widths, self-adhesive widths, selfadhesive sealing widths.

The advantages referred to in the following examples are especially concerned with: 1. Reduction of the breaking point 2. Oxidation reduction of the bitumen 3. Increase of elasticity 4. Increase of tensibility 5. Increase of ductility 6. Increase of adhesive power 7. Reduction of hardness 8. Improvement of the solubility for synthetic materials used in bitumen 9.Decrease of the agitating periods Example 1 Reduction of Breaking Point (Example of a Mixture for Roof and Sealing Widths) Breaking point after an agitating period of 24 hrs Breaking point at 160 0C B100/40 100% -130C -30C (without oil) B100/40 85% -190C -120C Oil (boiling 15% point above 2000C) 8100/40 85% -200C -140C Oil (boiling 15% point above 1 600C) The relatively unsaturated character of the oil achieves a reduction in the oxidation of the bitumen, which is shown in a substantial change in the breaking points of the specimens.

Example 2 Ductility, Tensibility, Elasticity, Hardness (Example of a Mixture for a Plastic Width Containing 50% or More Synthetic Material, Especially a Self-adhesive Plastic Width) ductility at 25 0C hardness elasticity DIN 1995 Tensibility (at 22 OCJ (at 22 C) material in cm % DIN 53504 DIN 53505 DIN 53512 I. Atactic poly propylene (APP) 50% / B 25* 50% 5 61 39 9 II. APP 50% / B 25* 25% 6 91 18 11 Oil 25% (boiling point above 2000C) *see DIN 1995 When adding oil the adhesive power is also increased.

When mixing synthetic materials into the bitumen further advantages can be achieved in accordance with the invention. The oil improves the dissolving of the synthetic material in the bitumen and in this way reduces the agitating periods considerably.

Example 3 Agitating Periods at 1 600C (Example of a Bitumen Plastic Width) Styrol-butadien- (17.65%) 1 5 portions 3 hrs 35 mins copolymerisate B 25 (87.35%) 70 portions Styrol-butadien- 15% copolymerisate B 25 70% 2 hrs 5 mins Oil (boiling point 15% above 2000 C) Styrol-butadien- 15% copolymerisate B25 70% 2 hrs 12 mins Oil (boiling point 15% above 1600C) Furthermore, it is possible, according to the process of the invention to imbibe or dissolve the synthetic materials in oil and then mix these solutions into the bitumen. As a result of this process a further considerable reduction of the agitating periods is achieved.

Example 4 Agitating Periods at 1 600C (Example of a Bitumen Plastic Width) Synthetic Material Synthetic material Material only mixed with oil previously dissolved in oil Styrol-butadien- 15% copolymerisate B 25 70% 2 hrs 5 mins 5 mins Oil (boiling point 15% above 20O0C) Styrol-butadien- 15% copolymerisate B 25 70% 2 hrs 12 mins 6 mins Oil (boiling point 15% above 1600C) To dissolve the synthetic materials e.g. styrol-butadien-copolymerisate can be achieved at 1 600C and then this process lasts 1 5 mins.

The solution thus obtained can be mixed into bitumen without any substantial loss of heat when being used immediately. Owing to this process not only the costs are reduced on account of the decrease of the agitating period, but also the oxidation of the bituminous compounds.

A further substantial advantage is that these synthetic solutions can be mixed into distilled bitumens, but also into blown bitumen, without reducing the quality. Furthermore, synthetic materials can be used such as synthetic caoutchouc, which are only rarely utilized in blown bitumen because of their bad solubility, for example.

Claims (2)

Claims

1. Bituminous in case synthetic materials containing compounds characterized by a content of a pyrolysis oil fraction obtained from scrap-rubber and boiling above 1 600 C.

2. Process of manufacturing a bituminous compound containing synthetic material characterized by the fact that the synthetic material is imbibed or dissolved in a pyrolysis oil fraction boiling above 1 600C which is obtained from scrap-rubber before mixing it into the bituminous compound.