EP0000847B1 - Vinyl chloride monomer production - Google Patents
Vinyl chloride monomer production Download PDFInfo
- Publication number
- EP0000847B1 EP0000847B1 EP78300280A EP78300280A EP0000847B1 EP 0000847 B1 EP0000847 B1 EP 0000847B1 EP 78300280 A EP78300280 A EP 78300280A EP 78300280 A EP78300280 A EP 78300280A EP 0000847 B1 EP0000847 B1 EP 0000847B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dichloroethane
- pyrolysis
- vinyl chloride
- process according
- dichloroethanes
- 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
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/25—Preparation of halogenated hydrocarbons by splitting-off hydrogen halides from halogenated hydrocarbons
Definitions
- the present invention relates to an essentially non-catalytic process for the preparation of vinyl chloride by the dehydrochlorination of mixtures of isomeric dichloroethanes.
- vinyl chloride can be produced by the pyrolytic dehydrochlorination of 1,2-dichloroethane.
- the process involves the passing of 1,2-dichloroethane through a small diameter reaction tube in which it is heated to elevated temperatures to bring about the dehydrochlorination thereof.
- it has not hitherto been possible to convert the isomeric 1,1-dichloroethane, which is a byproduct of the pyrolysis of 1,2-dichloroethane, into vinyl chloride in economic yields.
- US-A-2569923 describes a method of pyrolysing a mixture of 90% 1,1-dichloroethane and 10% 1,2-dichloroethane. However this mixture results only in a 35% conversion.
- the present invention is a process for producing vinyl chloride comprising pyrolysing at elevated temperature 1,2-dichloroethane mixed with between 0.1 and 10% by weight of 1,1-dichloroethane.
- the above reaction may be carried out in conventional tubular reactors as normally employed for the pyrolysis of 1,2-dichloroethane.
- the pyrolysis of mixtures of 1,1-dichloroethane and 1,2-dichloroethane in the specified range of concentrations significantly increases the conversion of 1, i-dichloroethane from about 20% (for the pure isomer) to above 90% (when present in the isomeric mixtures). Both below and above this range the conversion of the 1,2-isomer is depressed relatively.
- the amount of the 1,1-dichloroethane in the isomeric mixture being pyrolysed is preferably between 1 and 8%.
- the 1,1-isomer may be mixed with the pyrolysis feed prior to the introduction thereof into the reaction zone. Alternatively it may be incorporated in the pyrolysis feed in the reaction zone itself at the time of pyrolysis.
- the pyrolysis of the isomeric mixtures may be carried out in packed or unpacked tubular reactors. Where packed reactors are used they may suitably be packed with ceramic spheres.
- the pyrolysis of the isomeric mixture of dichloroethanes according to the present invention is suitably carried out at a temperature of between 450° and 550°C, preferably between 500° and 535°C.
- the pyrolysis of the isomeric mixture of dichloroethanes may be carried out at subatmospheric, atmospheric or super-atmospheric pressures. It is, however, preferred to use super- atmospheric pressure, preferably below 35 atmospheres.
- the pyrolysis of the isomeric mixture of dichloroethanes may be carried out in a continuous manner.
- the apparatus run at atmospheric pressure, consisted of feed reservoir, metering pump, vaporiser, cracker tube, coolers, organic product receiver, hydrogen chloride scrubbing column, scrub liquor reservoir and wet gas meter. There was also a nitrogen diluent/carrier feed applied to the vaporiser inlet.
- Feedstocks comprising pure 1,2-dichloroethane (1,2-EDC), 1,2-dichloroethane with up to 10 per cent by weight of 1,1-dich)oroethane (1,1-DCE) and also pure (98.2% by weight) 1,1-DCE were pyrolysed at a peak temperature of 500°C and a contact time of 4.5 seconds under conditions found to give a 50 per cent by weight conversion of pure 1,2-dichloroethane.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
- The present invention relates to an essentially non-catalytic process for the preparation of vinyl chloride by the dehydrochlorination of mixtures of isomeric dichloroethanes.
- It is known that vinyl chloride can be produced by the pyrolytic dehydrochlorination of 1,2-dichloroethane. The process involves the passing of 1,2-dichloroethane through a small diameter reaction tube in which it is heated to elevated temperatures to bring about the dehydrochlorination thereof. In contrast to this, it has not hitherto been possible to convert the isomeric 1,1-dichloroethane, which is a byproduct of the pyrolysis of 1,2-dichloroethane, into vinyl chloride in economic yields. US-A-2569923 describes a method of pyrolysing a mixture of 90% 1,1-dichloroethane and 10% 1,2-dichloroethane. However this mixture results only in a 35% conversion.
- It has now been found that mixtures of these isomers can be pyrolysed without impairing the quality or yield of vinyl chloride monomer produced by regulating the concentration of the two isomers in the mixture being pyrolysed.
- Accordingly, the present invention is a process for producing vinyl chloride comprising pyrolysing at elevated temperature 1,2-dichloroethane mixed with between 0.1 and 10% by weight of 1,1-dichloroethane.
- The above reaction may be carried out in conventional tubular reactors as normally employed for the pyrolysis of 1,2-dichloroethane. The pyrolysis of mixtures of 1,1-dichloroethane and 1,2-dichloroethane in the specified range of concentrations significantly increases the conversion of 1, i-dichloroethane from about 20% (for the pure isomer) to above 90% (when present in the isomeric mixtures). Both below and above this range the conversion of the 1,2-isomer is depressed relatively. The amount of the 1,1-dichloroethane in the isomeric mixture being pyrolysed is preferably between 1 and 8%. The 1,1-isomer may be mixed with the pyrolysis feed prior to the introduction thereof into the reaction zone. Alternatively it may be incorporated in the pyrolysis feed in the reaction zone itself at the time of pyrolysis.
- The pyrolysis of the isomeric mixtures may be carried out in packed or unpacked tubular reactors. Where packed reactors are used they may suitably be packed with ceramic spheres.
- The pyrolysis of the isomeric mixture of dichloroethanes according to the present invention is suitably carried out at a temperature of between 450° and 550°C, preferably between 500° and 535°C.
- The pyrolysis of the isomeric mixture of dichloroethanes may be carried out at subatmospheric, atmospheric or super-atmospheric pressures. It is, however, preferred to use super- atmospheric pressure, preferably below 35 atmospheres.
- The pyrolysis of the isomeric mixture of dichloroethanes may be carried out in a continuous manner.
- The advantages of the present invention are illustrated with reference to the following Examples.
- The apparatus, run at atmospheric pressure, consisted of feed reservoir, metering pump, vaporiser, cracker tube, coolers, organic product receiver, hydrogen chloride scrubbing column, scrub liquor reservoir and wet gas meter. There was also a nitrogen diluent/carrier feed applied to the vaporiser inlet.
- Feedstocks comprising pure 1,2-dichloroethane (1,2-EDC), 1,2-dichloroethane with up to 10 per cent by weight of 1,1-dich)oroethane (1,1-DCE) and also pure (98.2% by weight) 1,1-DCE were pyrolysed at a peak temperature of 500°C and a contact time of 4.5 seconds under conditions found to give a 50 per cent by weight conversion of pure 1,2-dichloroethane.
-
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3427077 | 1977-08-16 | ||
GB3427077 | 1977-08-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000847A1 EP0000847A1 (en) | 1979-02-21 |
EP0000847B1 true EP0000847B1 (en) | 1981-09-16 |
Family
ID=10363552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78300280A Expired EP0000847B1 (en) | 1977-08-16 | 1978-08-14 | Vinyl chloride monomer production |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0000847B1 (en) |
JP (1) | JPS5436205A (en) |
AU (1) | AU3890778A (en) |
CA (1) | CA1104590A (en) |
DE (1) | DE2861083D1 (en) |
GB (1) | GB2002357A (en) |
IT (1) | IT1098061B (en) |
NO (1) | NO782772L (en) |
NZ (1) | NZ188083A (en) |
PH (1) | PH14472A (en) |
PT (1) | PT68424A (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE478259A (en) * | 1946-12-17 | |||
DE1075592B (en) * | 1955-04-05 | 1960-02-18 | Ethyl Corporation, New York N Y (V St A) | Process for the production of vinyl chloride or vinylidene chloride |
FR1306945A (en) * | 1960-11-25 | 1962-10-19 | Wacker Chemie Gmbh | Process for reducing the decomposition of vinyl chloride during the catalytic dissociation of dichloroethane |
US3450780A (en) * | 1966-03-23 | 1969-06-17 | Monsanto Co | Dehydrohalogenation of 1,2-dichloroethane |
DE1925568C3 (en) * | 1969-05-20 | 1974-09-19 | Wacker-Chemie Gmbh, 8000 Muenchen | Process for the dehydrochlorination of asymmetrically substituted polychlorethanes |
-
1978
- 1978-07-19 GB GB7830310A patent/GB2002357A/en not_active Withdrawn
- 1978-08-08 NZ NZ188083A patent/NZ188083A/en unknown
- 1978-08-09 CA CA308,967A patent/CA1104590A/en not_active Expired
- 1978-08-11 IT IT26765/78A patent/IT1098061B/en active
- 1978-08-14 EP EP78300280A patent/EP0000847B1/en not_active Expired
- 1978-08-14 DE DE7878300280T patent/DE2861083D1/en not_active Expired
- 1978-08-14 PT PT68424A patent/PT68424A/en unknown
- 1978-08-15 AU AU38907/78A patent/AU3890778A/en active Pending
- 1978-08-15 NO NO782772A patent/NO782772L/en unknown
- 1978-08-15 JP JP9873278A patent/JPS5436205A/en active Pending
- 1978-08-16 PH PH21504A patent/PH14472A/en unknown
Also Published As
Publication number | Publication date |
---|---|
PH14472A (en) | 1981-08-07 |
PT68424A (en) | 1978-09-01 |
AU3890778A (en) | 1980-02-21 |
NZ188083A (en) | 1979-11-01 |
EP0000847A1 (en) | 1979-02-21 |
DE2861083D1 (en) | 1981-12-03 |
NO782772L (en) | 1979-02-19 |
IT7826765A0 (en) | 1978-08-11 |
CA1104590A (en) | 1981-07-07 |
GB2002357A (en) | 1979-02-21 |
JPS5436205A (en) | 1979-03-16 |
IT1098061B (en) | 1985-08-31 |
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