GB1495249A - Equipment cleaning process - Google Patents
Equipment cleaning processInfo
- Publication number
- GB1495249A GB1495249A GB2007976A GB2007976A GB1495249A GB 1495249 A GB1495249 A GB 1495249A GB 2007976 A GB2007976 A GB 2007976A GB 2007976 A GB2007976 A GB 2007976A GB 1495249 A GB1495249 A GB 1495249A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solvent
- equipment
- residues
- dimethyl
- draining
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/008—Processes of polymerisation cleaning reaction vessels using chemicals
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Detergent Compositions (AREA)
Abstract
1495249 Removing nitrile polymer residues MONSANTO CO 14 May 1976 [16 May 1975] 20079/76 Heading C3P Residues of a polymer having 55-85% by wt. of nitrile monomer units (calculated as acrylonitrile) are removed from processing equipment, e.g. polymerization reactors and reflux condensers, by contacting the equipment with a solvent which is dimethyl formamide, dimethyl acetamide, dimethyl sulphoxide or N - methyl - 2 - pyrrolidone under agitation and at a temperature of 75‹ C. to the b.p. of the solvent for sufficient time to dissolve all the residues, draining the solvent, contacting the equipment with fresh solvent to dissolve the film residue of spent solvent, and draining the solvent and then rinsing the equipment with water at a temperature of 50-200‹ C. until the solvent concentration in the rinsing water is below 1 p.p.m. In the examples reactor vessels which had been used to polymerize acrylonitrile and styrene were washed with dimethyl formamide, cold and hot water successively.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57822475A | 1975-05-16 | 1975-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1495249A true GB1495249A (en) | 1977-12-14 |
Family
ID=24311935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2007976A Expired GB1495249A (en) | 1975-05-16 | 1976-05-14 | Equipment cleaning process |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS51140988A (en) |
| DE (1) | DE2621511A1 (en) |
| FR (1) | FR2311044A1 (en) |
| GB (1) | GB1495249A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5698045A (en) * | 1995-04-13 | 1997-12-16 | Basf Corporation | Method of cleaning polymer residues with NMP |
| US8653015B2 (en) | 2011-04-13 | 2014-02-18 | American Sterilizer Company | Environmentally friendly, multi-purpose refluxing cleaner |
| CN115889369A (en) * | 2023-02-24 | 2023-04-04 | 山西钢科碳材料有限公司 | Cleaning method of gel in acrylonitrile polymerization reactor |
-
1976
- 1976-05-14 DE DE19762621511 patent/DE2621511A1/en active Pending
- 1976-05-14 FR FR7614564A patent/FR2311044A1/en active Granted
- 1976-05-14 GB GB2007976A patent/GB1495249A/en not_active Expired
- 1976-05-14 JP JP5524376A patent/JPS51140988A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5698045A (en) * | 1995-04-13 | 1997-12-16 | Basf Corporation | Method of cleaning polymer residues with NMP |
| US8653015B2 (en) | 2011-04-13 | 2014-02-18 | American Sterilizer Company | Environmentally friendly, multi-purpose refluxing cleaner |
| CN115889369A (en) * | 2023-02-24 | 2023-04-04 | 山西钢科碳材料有限公司 | Cleaning method of gel in acrylonitrile polymerization reactor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2621511A1 (en) | 1976-11-25 |
| FR2311044B1 (en) | 1979-07-13 |
| JPS51140988A (en) | 1976-12-04 |
| FR2311044A1 (en) | 1976-12-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |