EP0656875A1 - Process for producing vinyl chloride - Google Patents

Process for producing vinyl chloride

Info

Publication number
EP0656875A1
EP0656875A1 EP93919143A EP93919143A EP0656875A1 EP 0656875 A1 EP0656875 A1 EP 0656875A1 EP 93919143 A EP93919143 A EP 93919143A EP 93919143 A EP93919143 A EP 93919143A EP 0656875 A1 EP0656875 A1 EP 0656875A1
Authority
EP
European Patent Office
Prior art keywords
edc
vinyl chloride
benzotrichloride
producing vinyl
wash
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Withdrawn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
EP93919143A
Other languages
German (de)
French (fr)
Inventor
Ingolf Mielke
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of EP0656875A1 publication Critical patent/EP0656875A1/en
Withdrawn legal-status Critical Current

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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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C21/00—Acyclic unsaturated compounds containing halogen atoms
    • C07C21/02—Acyclic unsaturated compounds containing halogen atoms containing carbon-to-carbon double bonds
    • C07C21/04—Chloro-alkenes
    • C07C21/06—Vinyl chloride

Definitions

  • US Pat. No. 4,851,597 discloses the thermal cleavage of 1,2-dichloroethane (EDC) to vinyl chloride (VC) in the presence of trichloroacetyl chloride or a compound having 3 carbon atoms, at least 6 chlorine atoms, 0 or 1 oxygen atom and, bound to this carbon atom to carry out 0 or 1 hydrogen atom.
  • EDC 1,2-dichloroethane
  • VC vinyl chloride
  • the invention therefore relates to the use of benzotrichloride as an additive in the thermal cracking of EDC to VC.
  • the implementation can be carried out according to the information provided by the
  • the thermal splitting is expediently carried out at 300 to 600 ° C., under normal pressure or increased pressure up to about 50 bar (5 MPa). Pressures of 10 to 40 bar (1 to 4 MPa) are preferred. Even relatively small amounts of benzotrichloride generate significantly higher sales of VC. For example, 250 ppm benzotrichloride increases the VC yield from about 52% (feed EDC without additive) to about 76%. Higher additions result in a further, but not so strong increase in the yield.
  • benzotrichloride can be added to the pre-cleaned EDC (feed EDC).
  • An apparatus consisting of a storage vessel for EDC, a metering pump, connected to one filled with glass balls
  • Evaporator tube which in turn is connected to a quartz tube, which has an inner diameter of 18 mm and can be heated to a length of 500 mm.
  • the outlet of the quartz tube is connected to three series-connected wash bottles and a gas collection bottle.
  • the first wash bottle seen from the end of the quartz tube is provided with a cooling jacket (water cooling) and is used for condensation of the unreacted EDC.
  • the second and third wash bottles contain distilled water to collect the hydrogen chloride formed during the EDC cleavage.
  • VC + by-products finally flow through a gas collection bottle for sampling.
  • the evaporator tube is heated to 220 ° C. and the quartz tube to 490 ° C. (measured on the inner wall of the tube at the end of the heating zone).
  • the storage vessel is filled with EDC, to which the desired amount of initiator has been added. 90 g per hour EDC run into the heated evaporator tube via the metering pump and are evaporated there. The vapors are released through the quartz tube
  • the sales values are mean values from at least two determinations.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Silicon Compounds (AREA)

Abstract

The admixture of benzotrichloride allows considerably higher yields of vinyl chloride to be obtained by thermal cleavage of 1,2-dichloroethane.

Description

Beschreibung description
Verfahren zur Herstellung von VinylchloridProcess for the production of vinyl chloride
Aus der US-A 4 851 597 ist es bekannt, die thermische Spaltung von 1,2-Dichlorethan (EDC) zu Vinylchlorid (VC) in Gegenwart von Trichloracetylchlorid oder einer Verbindung mit 3 Kohlenstoffatomen, mindestens 6 Chloratomen, 0 oder 1 Sauerstoffatom und, je Kohlenstoffatom an dieses gebunden, 0 oder 1 Wasserstoffatom durchzuführen. Durch diese Zusätze wird der Umsetzungsgrad erhöht beziehungsweise bei gleichem Umsatz die Spalttemperatur erniedrigt, wodurch eine Verminderung der Nebenprodukte beobachtet wird.US Pat. No. 4,851,597 discloses the thermal cleavage of 1,2-dichloroethane (EDC) to vinyl chloride (VC) in the presence of trichloroacetyl chloride or a compound having 3 carbon atoms, at least 6 chlorine atoms, 0 or 1 oxygen atom and, bound to this carbon atom to carry out 0 or 1 hydrogen atom. These additives increase the degree of conversion or lower the cleavage temperature for the same conversion, as a result of which a reduction in the by-products is observed.
Überraschenderweise wurde nun gefunden, daß bei dieser Umsetzung ein Zusatz von Benzotrichlorid eine noch wesentlich stärkere Umsatzerhöhung bewirkt. Die Erfindung betrifft deshalb die Verwendung von Benzotrichlorid als Zusatz bei der thermischen Spaltung von EDC zu VC.Surprisingly, it has now been found that the addition of benzotrichloride brings about an even greater increase in turnover in this reaction. The invention therefore relates to the use of benzotrichloride as an additive in the thermal cracking of EDC to VC.
Die Umsetzung kann entsprechend den Angaben derThe implementation can be carried out according to the information provided by the
US-A 4 851 597 erfolgen. Bevorzugte Ausführungsformen der Erfindung werden im folgenden näher erläutert:US-A 4,851,597. Preferred embodiments of the invention are explained in more detail below:
Die thermische Spaltung erfolgt zweckmäßig bei 300 bis 600 °C, unter Normaldruck oder erhöhtem Druck bis zu etwa 50 bar (5 MPa) . Bevorzugt sind Drücke von 10 bis 40 bar (1 bis 4 MPa) . Bereits relativ geringe Mengen an Benzotrichlorid erbringen deutlich erhöhte Umsätze an VC. So steigern beispielsweise 250 ppm Benzotrichlorid die VC-Ausbeute von etwa 52 % (Feed-EDC ohne Zusatz) auf etwa 76 %. Höhere Zusatzmengen bedingen eine weitere, aber nicht mehr so starke Zunahme der Ausbeute.The thermal splitting is expediently carried out at 300 to 600 ° C., under normal pressure or increased pressure up to about 50 bar (5 MPa). Pressures of 10 to 40 bar (1 to 4 MPa) are preferred. Even relatively small amounts of benzotrichloride generate significantly higher sales of VC. For example, 250 ppm benzotrichloride increases the VC yield from about 52% (feed EDC without additive) to about 76%. Higher additions result in a further, but not so strong increase in the yield.
überraschenderweise zeigt sich überdies, daß das umständlich zu entfernende Chloral in erheblich geringerer Menge gebildet wird.Surprisingly, it is also shown that the chloral, which is difficult to remove, is formed in a considerably smaller amount.
Benzotrichlorid kann - wie in der US-A 4 851 597 beschrieben - dem vorgereinigten EDC (Feed-EDC) zugesetzt werden.As described in US Pat. No. 4,851,597, benzotrichloride can be added to the pre-cleaned EDC (feed EDC).
Die Erfindung wird im folgenden Beispiel näher erläutert. Prozentangaben beziehen sich hierbei auf das Gewicht.The invention is explained in more detail in the following example. Percentages relate to the weight.
Beispielexample
Es wird eine Apparatur verwendet, bestehend aus einem Vorratsgefäß für EDC, einer Dosierpumpe, daran angeschlossen einem mit Glaskugeln gefülltenAn apparatus is used, consisting of a storage vessel for EDC, a metering pump, connected to one filled with glass balls
Verdampferrohr, das wiederum mit einem Quarzrohr verbunden ist, welches 18 mm Innendurchmesser hat und auf einer Länge von 500 mm beheizt werden kann. Der Ausgang des Quarzrohres ist mit drei hintereinander geschalteten Waschflaschen und einer Gassammelflasche verbunden. Die vom Ende des Quarzrohres aus gesehen erste Waschflasche ist mit einem Kühlmantel (Wasserkühlung) versehen und dient zur Kondensation des nicht umgesetzten EDC. Die zweite und dritte Waschflasche enthalten destilliertes Wasser zum Auffangen des bei der EDC-Spaltung entstandenen Chlorwasserstoffes. Die nunmehr HCl-freien und nur noch EDC-Spuren enthaltenden ReaktionsgaseEvaporator tube, which in turn is connected to a quartz tube, which has an inner diameter of 18 mm and can be heated to a length of 500 mm. The outlet of the quartz tube is connected to three series-connected wash bottles and a gas collection bottle. The first wash bottle seen from the end of the quartz tube is provided with a cooling jacket (water cooling) and is used for condensation of the unreacted EDC. The second and third wash bottles contain distilled water to collect the hydrogen chloride formed during the EDC cleavage. The reaction gases, now free of HCl and containing only EDC traces
(VC + Nebenprodukte) durchströmen schließlich eine Gassammelflasche zur Probenahme. Während des jeweiligen Versuches wird das Verdampferrohr auf 220 °C und das Quarzrohr auf 490 °C (gemessen an Rohrinnenwand am Ende der Beheizungszone) erwärmt. Das Vorratsgefäß wird mit EDC, dem die gewünschte Menge an Initiator zugesetzt worden ist, gefüllt. Über die Dosierpumpe laufen 90 g pro Stunde EDC in das beheizte Verdampferrohr und werden dort verdampft. Die Dämpfe werden durch das Quarzrohr(VC + by-products) finally flow through a gas collection bottle for sampling. During the respective test, the evaporator tube is heated to 220 ° C. and the quartz tube to 490 ° C. (measured on the inner wall of the tube at the end of the heating zone). The storage vessel is filled with EDC, to which the desired amount of initiator has been added. 90 g per hour EDC run into the heated evaporator tube via the metering pump and are evaporated there. The vapors are released through the quartz tube
(Verweilzeit circa 10 Sekunden) und die anschließenden Waschflaschen sowie die Gassammelflasche geleitet. Nach Einstellung stationärer Versuchsbedingungen beträgt die Versuchsdauer jeweils 2 Stunden. Anschließend wird das in der ersten Waschflasche auskondensierte nicht umgesetzte Dichlorethan gewogen, mittels GC auf Nebenprodukte untersucht und der im EDC enthaltene Chlorwasserstoff durch Waschen mit Wasser abgetrennt. Die wäßrige Phase wird mit den Waschwässern aus der zweiten und dritten Waschflache vereinigt und die Salzsäure titriert. Daraus ergibt sich der EDC-Umsatz im Quarzrohr. Die in der Gassammelflasche enthaltene Gasprobe wird mittels GC auf VC und Nebenprodukte analysiert. Tabelle(Dwell time approx. 10 seconds) and the subsequent wash bottles and the gas collection bottle. After setting stationary test conditions, the test duration is 2 hours each. The unreacted dichloroethane which has condensed out in the first wash bottle is then weighed, examined for by-products by means of GC and the hydrogen chloride contained in the EDC is separated off by washing with water. The aqueous phase is combined with the wash waters from the second and third wash surfaces and the hydrochloric acid is titrated. This results in EDC sales in the quartz tube. The gas sample contained in the gas collection bottle is analyzed by GC for VC and by-products. table
Zusatz von Benzotrichlorid zu EDC (Feed-Qualität)Addition of benzotrichloride to EDC (feed quality)
Die Umsatzwerte sind Mittelwerte aus mindestens zwei Bestimmungen. The sales values are mean values from at least two determinations.

Claims

Anspruchclaim
Verwendung von Benzotrichlorid als Zusatz bei der thermischen Spaltung von 1,2-Dichlorethan zu Vinylchlorid. Use of benzotrichloride as an additive in the thermal cracking of 1,2-dichloroethane to vinyl chloride.
EP93919143A 1992-08-27 1993-08-23 Process for producing vinyl chloride Withdrawn EP0656875A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4228593A DE4228593A1 (en) 1992-08-27 1992-08-27 Process for the production of vinyl chloride
DE4228593 1992-08-27
PCT/EP1993/002260 WO1994005609A1 (en) 1992-08-27 1993-08-23 Process for producing vinyl chloride

Publications (1)

Publication Number Publication Date
EP0656875A1 true EP0656875A1 (en) 1995-06-14

Family

ID=6466616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919143A Withdrawn EP0656875A1 (en) 1992-08-27 1993-08-23 Process for producing vinyl chloride

Country Status (13)

Country Link
US (1) US5210345A (en)
EP (1) EP0656875A1 (en)
JP (1) JPH08500600A (en)
KR (1) KR950702951A (en)
CN (1) CN1088904A (en)
CA (1) CA2143305A1 (en)
DE (1) DE4228593A1 (en)
FI (1) FI950868A (en)
MX (1) MX9305211A (en)
RU (1) RU95106778A (en)
TW (1) TW212169B (en)
WO (1) WO1994005609A1 (en)
ZA (1) ZA936263B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228593A1 (en) * 1992-08-27 1994-03-03 Hoechst Ag Process for the production of vinyl chloride
KR20020039677A (en) * 1999-10-08 2002-05-27 크리스 로저 에이치 Separation of Halogenated Compounds
FR2830859B1 (en) * 2001-10-17 2004-06-18 Atofina PROCESS FOR OBTAINING POLYMERIZABLE VINYL CHLORIDE FROM A CRUDE PRODUCT FROM THE PYROLYSIS OF 1,2-DICHLOROETHANE
KR100843605B1 (en) * 2006-01-27 2008-07-03 주식회사 엘지화학 The method for preparing vinyl chloride monomer using ethane in natural gas
DE102008049262B4 (en) 2008-09-26 2016-03-17 Thyssenkrupp Industrial Solutions Ag Process and apparatus for the preparation of ethylenically unsaturated halogenated hydrocarbons
DE102008049260B4 (en) 2008-09-26 2016-03-10 Thyssenkrupp Industrial Solutions Ag Process and apparatus for the preparation of ethylenically unsaturated halogenated hydrocarbons

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328691A1 (en) * 1983-08-09 1985-02-21 Hoechst Ag, 6230 Frankfurt METHOD FOR THERMALLY CLEAVING 1,2-DICHLORETHANE
US4584420A (en) * 1984-06-25 1986-04-22 Ppg Industries, Inc. Method for producing vinyl chloride
DE4228593A1 (en) * 1992-08-27 1994-03-03 Hoechst Ag Process for the production of vinyl chloride

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9405609A1 *

Also Published As

Publication number Publication date
CA2143305A1 (en) 1994-03-17
ZA936263B (en) 1995-01-17
FI950868A0 (en) 1995-02-24
KR950702951A (en) 1995-08-23
DE4228593A1 (en) 1994-03-03
TW212169B (en) 1993-09-01
CN1088904A (en) 1994-07-06
FI950868A (en) 1995-02-24
RU95106778A (en) 1996-12-20
MX9305211A (en) 1994-05-31
US5210345A (en) 1993-05-11
WO1994005609A1 (en) 1994-03-17
JPH08500600A (en) 1996-01-23

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