CN107936157A - The method for manufacturing polyvinyl chloride - Google Patents

The method for manufacturing polyvinyl chloride Download PDF

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CN107936157A
CN107936157A CN201711146869.7A CN201711146869A CN107936157A CN 107936157 A CN107936157 A CN 107936157A CN 201711146869 A CN201711146869 A CN 201711146869A CN 107936157 A CN107936157 A CN 107936157A
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methanol
ethene
reactor
gas
coal
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李瑞雪
赵安平
周晓埜
赵然
赵一然
李平
贺华
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    • 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
    • C08F114/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F114/02—Monomers containing chlorine
    • C08F114/04—Monomers containing two carbon atoms
    • C08F114/06—Vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • 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
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C07C29/1516—Multisteps
    • C07C29/1518—Multisteps one step being the formation of initial mixture of carbon oxides and hydrogen for synthesis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00—Technologies relating to oil refining and petrochemical industry
    • Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P30/00—Technologies relating to oil refining and petrochemical industry
    • Y02P30/40—Ethylene production

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A kind of method for manufacturing polyvinyl chloride, this method is using coal as raw material preparing chloroethylene；Methanol is prepared by raw material of coal first, then by preparing ethene using methanol as raw material, ethene produces vinyl chloride by chloridising again, then generates polyvinyl chloride by vinyl chloride sudden reaction；The derived product kind of coal is widened, this technique produces polyvinyl chloride with " coal " generation " oil ", realizes with the energy strategy of " coal " generation " oil ", there is provided a kind of more economical Production of PVC method.The by-product carbinol produced at the same time in any chemical engineering process can also be converted into the product polyvinyl chloride more having an economic benefit by this technique.

Description

The method for manufacturing polyvinyl chloride
Technical field
The present invention relates to technical field of organic chemistry, and in particular to a kind of method for manufacturing polyvinyl chloride.
Background technology
Vinyl chloride is a kind of important monomer for being applied to synthesizing polyvinyl chloride (PVC), can pass through ethylene process or acetylene legal system .Ethylene process mainly using oil and crude salt as raw material, by ethene made from petroleum cracking, then has process for oxychlorination of ethylene that chlorine is made Ethene, chloroethylene polymerization obtain polyvinyl chloride；Acetylene rule produces second using calcium carbide and crude salt as main production raw material by calcium carbide Alkynes, acetylene generates vinyl chloride with hcl reaction again, then obtains polyvinyl chloride by chloroethylene polymerization.China by rich coal, it is oil-poor, The resource constraint of few gas, carbide prepare vinyl chloride and still occupy sizable market ratio.
But in actual production, 1 ton of acetenyl of calcium carbide legal system needs 3 tons of calcium carbides, per ton using calcium carbide price as 2500 yuan Calculate, the raw material calcium carbide of one ton of acetylene at least 7500 yuan of value on demand is expensive；Polyvinyl chloride is prepared using ethylene process Raw material is all to use oil, and petroleum resources are extremely in short supply at present, therefore the method for seeking new manufacture polyvinyl chloride is extremely urgent.
The content of the invention
In view of this, it is necessary to which a kind of method that polyvinyl chloride is manufactured using coal as raw material is provided.
A kind of method for manufacturing polyvinyl chloride, prepares methanol by raw material of coal first, then prepares second by raw material of methanol Alkene, vinyl chloride is made by oxychlorination balancing method in ethene, then generates polyvinyl chloride by vinyl chloride sudden reaction；
Specific preparation process comprises the following steps：
Prepare methanol：Raw material using dry pulverized coal to prepare methanol, gasification of coal is generated by dry coal powder pressure gasifying, then will gasification Coal is passed through to gasification furnace with pure oxygen and carries out oxidation reaction, and generation contains CO and H2Unpurifed gas, specific reaction equation is：CmHnSr+m/ 2O2→mCO+[n/(2-r)]H2+rH2S；Part unpurifed gas is taken by CO shift conversion steps, to adjust the ratio of CO in unpurifed gas Example, specific reaction equation are：CO+H2O→H2+CO2, make CO and H in gasification furnace2Ratio is 1:2~1:Between 4；Then by thick water coal Gas be passed through in desulfuration absorbing tower with by the H in unpurifed gas2S gases remove, and contain methanol in desulfuration absorbing tower, can be by slightly Acid gas adsorption in water-gas, CO and H2The methanol reactor added with copper-based catalysts is directed into through desulfuration absorbing tower In with synthesizing methanol, synthesis pressure is 3MPa~10MPa, and synthesis temperature is 150 DEG C~350 DEG C, and the reaction equation of synthesizing methanol is： CO+2H2→CH3OH, CO2+3H2→CH3OH+H2O；
Prepare ethene：Ethene is prepared using methanol obtained above as raw material, methanol prepares ethene and is divided into two stages, and first Stage：First methanol is passed through into the first reactor containing metal-zeolitic dual-function catalyst so that methanol with high selectivity Dimethyl ether is converted into, specific reaction equation is 2CH3OH→CH3OCH3+H2O；Second stage：By the dimethyl ether of generation be passed through to containing In the second reactor of SAPO-34 molecular sieve catalysts so that dimethyl ether in high selectivity be converted into containing ethene, propylene and its The mix products of his low-carbon alkene, reaction equation 2CH3OCH3→2CH2=CH2+2H2O, then mix products are sent to separation of olefins The isolated ethene of unit；
Prepare vinyl chloride：It is divided into three steps, the first step：Ethene obtained above is passed through into first reactor, while to Chlorine is passed through in first reactor, so that with chlorine addition reaction generation dichloroethanes, the addition of ethene and chlorine occur for ethene It is 1 to measure molar ratio:1~2:1, specific reaction equation is：CH2=CH2+Cl2→ClCH2CH2Cl；Second step：By two chloroethenes of generation Alkane is directed into second reactor, while is heated up to second reactor, makes the temperature of second reactor at 400 DEG C -700 DEG C, with Dichloroethanes is set to be thermally cracked to produce vinyl chloride and hydrogen chloride, specific reaction equation is：ClCH2CH2Cl→CH2=CHCl+HCl, will HCl is isolated, and the HCl gases isolated are directed into the 3rd reactor to carry out next reaction；3rd step：To the 3rd reactor In be filled with oxygen and the above-mentioned ethene prepared so that ethene, oxygen and hydrogen chloride gas precursor reactant generation dichloroethanes, by chlorine Change hydrogen to consume, specific reaction equation is CH2=CH2+HCl+O2→ClCH2CH2Cl+H2O；
Prepare polyvinyl chloride：Vinyl chloride is passed through into the 4th reactor, by the temperature control of the 4th reactor at 10 DEG C ~100 DEG C, while peroxy initiator is added to trigger chloroethylene polymerization to generate polyvinyl chloride.
The present invention uses above-mentioned technical proposal, and its advantage is：This method is using coal as raw material preparing chloroethylene；First with Coal prepares methanol for raw material, and then by preparing ethene using methanol as raw material, ethene produces vinyl chloride by chloridising again, Polyvinyl chloride is generated by vinyl chloride sudden reaction again；The derived product kind of coal is widened, this technique is raw with " coal " generation " oil " Polyvinyl chloride is produced, is realized with the energy strategy of " coal " generation " oil ", there is provided a kind of more economical Production of PVC method.Together When any chemical engineering process in the by-product carbinol that produces the product more having an economic benefit can be also converted into by this technique gathers Vinyl chloride.
Embodiment
Embodiment 1
A kind of method for manufacturing polyvinyl chloride, prepares methanol by raw material of coal first, then prepares second by raw material of methanol Alkene, vinyl chloride is made by oxychlorination balancing method in ethene, then generates polyvinyl chloride by vinyl chloride sudden reaction；
Specific preparation process comprises the following steps：
Prepare methanol：Raw material using dry pulverized coal to prepare methanol, gasification of coal is generated by dry coal powder pressure gasifying, then will gasification Coal is passed through to gasification furnace with pure oxygen and carries out oxidation reaction, and generation contains CO and H2Unpurifed gas, specific reaction equation is：CmHnSr+m/ 2O2→mCO+[n/(2-r)]H2+rH2S；Part unpurifed gas is taken by CO shift conversion steps, to adjust the ratio of CO in unpurifed gas Example, specific reaction equation are：CO+H2O→H2+CO2, make CO and H in gasification furnace2Ratio is 1:Between 2.2；Then by unpurifed gas Be passed through in desulfuration absorbing tower with by the H in unpurifed gas2S gases remove, and contain methanol in desulfuration absorbing tower, can be by thick water Acid gas adsorption in coal gas, CO and H2It is directed into through desulfuration absorbing tower in the methanol reactor added with copper-based catalysts With synthesizing methanol, synthesis pressure 5MPa, synthesis temperature is 260 DEG C, and the reaction equation of synthesizing methanol is：CO+2H2→CH3OH, CO2 +3H2→CH3OH+H2O；
Prepare ethene：Ethene is prepared using methanol obtained above as raw material, methanol prepares ethene and is divided into two stages, and first Stage：First methanol is passed through into the first reactor containing metal-zeolitic dual-function catalyst so that methanol with high selectivity Dimethyl ether is converted into, specific reaction equation is 2CH3OH→CH3OCH3+H2O；Second stage：By the dimethyl ether of generation be passed through to containing In the second reactor of SAPO-34 molecular sieve catalysts so that dimethyl ether in high selectivity be converted into containing ethene, propylene and its The mix products of his low-carbon alkene, reaction equation 2CH3OCH3→2CH2=CH2+2H2O, then mix products are sent to separation of olefins The isolated ethene of unit；
Prepare vinyl chloride：It is divided into three steps, the first step：Ethene obtained above is passed through into first reactor, while to Chlorine is passed through in first reactor, so that with chlorine addition reaction generation dichloroethanes, the addition of ethene and chlorine occur for ethene It is 1.1 to measure molar ratio:So that chlorine reaction is complete, specific reaction equation is for 1.0, somewhat Excess ethylene：CH2=CH2+Cl2→ ClCH2CH2Cl；Second step：The dichloroethanes of generation is directed into second reactor, while is heated up to second reactor, makes the The temperature of two reactors is at 500 DEG C, so that dichloroethanes is thermally cracked to produce vinyl chloride and hydrogen chloride, specific reaction equation is： ClCH2CH2Cl→CH2=CHCl+HCl, HCl is isolated, and the HCl gases isolated are directed into the 3rd reactor to carry out Next reaction；3rd step：Oxygen and the above-mentioned ethene prepared are filled with into the 3rd reactor, so that ethene, oxygen and chlorination Hydrogen precursor reactant generates dichloroethanes, hydrogen chloride gas is consumed, specific reaction equation is CH2=CH2+HCl+O2→ ClCH2CH2Cl+H2O；
Prepare polyvinyl chloride：Vinyl chloride is passed through into the 4th reactor, by the temperature control of the 4th reactor at 70 DEG C, Peroxy initiator is added at the same time to trigger chloroethylene polymerization to generate polyvinyl chloride.
Embodiment 2：
A kind of method for manufacturing polyvinyl chloride, prepares methanol by raw material of coal first, then prepares second by raw material of methanol Alkene, vinyl chloride is made by oxychlorination balancing method in ethene, then generates polyvinyl chloride by vinyl chloride sudden reaction；
Specific preparation process comprises the following steps：
Prepare methanol：Raw material using dry pulverized coal to prepare methanol, gasification of coal is generated by dry coal powder pressure gasifying, then will gasification Coal is passed through to gasification furnace with pure oxygen and carries out oxidation reaction, and generation contains CO and H2Unpurifed gas, specific reaction equation is：CmHnSr+m/ 2O2→mCO+[n/(2-r)]H2+rH2S；Part unpurifed gas is taken by CO shift conversion steps, to adjust the ratio of CO in unpurifed gas Example, specific reaction equation are：CO+H2O→H2+CO2, make CO and H in gasification furnace2Ratio is 1:Between 4；Then unpurifed gas is led to Enter in desulfuration absorbing tower with by the H in unpurifed gas2S gases remove, and contain methanol in desulfuration absorbing tower, can be by thick water coal Acid gas adsorption in gas, CO and H2Through desulfuration absorbing tower be directed into the methanol reactor added with copper-based catalysts with Synthesizing methanol, synthesis pressure 10MPa, synthesis temperature are 350 DEG C, and the reaction equation of synthesizing methanol is：CO+2H2→CH3OH, CO2+ 3H2→CH3OH+H2O；
Prepare ethene：Ethene is prepared using methanol obtained above as raw material, methanol prepares ethene and is divided into two stages, and first Stage：First methanol is passed through into the first reactor containing metal-zeolitic dual-function catalyst so that methanol with high selectivity Dimethyl ether is converted into, specific reaction equation is 2CH3OH→CH3OCH3+H2O；Second stage：By the dimethyl ether of generation be passed through to containing In the second reactor of SAPO-34 molecular sieve catalysts so that dimethyl ether in high selectivity be converted into containing ethene, propylene and its The mix products of his low-carbon alkene, reaction equation 2CH3OCH3→2CH2=CH2+2H2O, then mix products are sent to separation of olefins The isolated ethene of unit；
Prepare vinyl chloride：It is divided into three steps, the first step：Ethene obtained above is passed through into first reactor, while to Chlorine is passed through in first reactor, so that with chlorine addition reaction generation dichloroethanes, the addition of ethene and chlorine occur for ethene It is 2 to measure molar ratio:1, specific reaction equation is：CH2=CH2+Cl2→ClCH2CH2Cl；Second step：The dichloroethanes of generation is imported Heat up into second reactor, while to second reactor, make the temperature of second reactor at 700 DEG C, so that dichloroethanes is warm Vinyl chloride and hydrogen chloride are cracked to form, specific reaction equation is：ClCH2CH2Cl→CH2=CHCl+HCl, HCl is isolated, separation The HCl gases gone out are directed into the 3rd reactor to carry out next reaction；3rd step：Oxygen and upper is filled with into the 3rd reactor The ethene prepared is stated, so that ethene, oxygen and hydrogen chloride gas precursor reactant generation dichloroethanes, hydrogen chloride gas is consumed Fall, specific reaction equation is CH2=CH2+HCl+O2→ClCH2CH2Cl+H2O；
Prepare polyvinyl chloride：Vinyl chloride is passed through into the 4th reactor, by the temperature control of the 4th reactor 100 DEG C, while peroxy initiator is added to trigger chloroethylene polymerization to generate polyvinyl chloride.
Embodiment 3：
A kind of method for manufacturing polyvinyl chloride, prepares methanol by raw material of coal first, then prepares second by raw material of methanol Alkene, vinyl chloride is made by oxychlorination balancing method in ethene, then generates polyvinyl chloride by vinyl chloride sudden reaction；
Specific preparation process comprises the following steps：
Prepare methanol：Raw material using dry pulverized coal to prepare methanol, gasification of coal is generated by dry coal powder pressure gasifying, then will gasification Coal is passed through to gasification furnace with pure oxygen and carries out oxidation reaction, and generation contains CO and H2Unpurifed gas, specific reaction equation is：CmHnSr+m/ 2O2→mCO+[n/(2-r)]H2+rH2S；Part unpurifed gas is taken by CO shift conversion steps, to adjust the ratio of CO in unpurifed gas Example, specific reaction equation are：CO+H2O→H2+CO2, make CO and H in gasification furnace2Ratio is 1:Between 2；Then unpurifed gas is led to Enter in desulfuration absorbing tower with by the H in unpurifed gas2S gases remove, and contain methanol in desulfuration absorbing tower, can be by thick water coal Acid gas adsorption in gas, CO and H2Through desulfuration absorbing tower be directed into the methanol reactor added with copper-based catalysts with Synthesizing methanol, synthesis pressure 3MPa, synthesis temperature are 150 DEG C, and the reaction equation of synthesizing methanol is：CO+2H2→CH3OH, CO2+ 3H2→CH3OH+H2O；
Prepare ethene：Ethene is prepared using methanol obtained above as raw material, methanol prepares ethene and is divided into two stages, and first Stage：First methanol is passed through into the first reactor containing metal-zeolitic dual-function catalyst so that methanol with high selectivity Dimethyl ether is converted into, specific reaction equation is 2CH3OH→CH3OCH3+H2O；Second stage：By the dimethyl ether of generation be passed through to containing In the second reactor of SAPO-34 molecular sieve catalysts so that dimethyl ether in high selectivity be converted into containing ethene, propylene and its The mix products of his low-carbon alkene, reaction equation 2CH3OCH3→2CH2=CH2+2H2O, then mix products are sent to separation of olefins The isolated ethene of unit；
Prepare vinyl chloride：It is divided into three steps, the first step：Ethene obtained above is passed through into first reactor, while to Chlorine is passed through in first reactor, so that with chlorine addition reaction generation dichloroethanes, the addition of ethene and chlorine occur for ethene It is 1 to measure molar ratio:1, specific reaction equation is：CH2=CH2+Cl2→ClCH2CH2Cl；Second step：The dichloroethanes of generation is imported Heat up into second reactor, while to second reactor, make the temperature of second reactor at 400 DEG C, so that dichloroethanes is warm Vinyl chloride and hydrogen chloride are cracked to form, specific reaction equation is：ClCH2CH2Cl→CH2=CHCl+HCl, HCl is isolated, separation The HCl gases gone out are directed into the 3rd reactor to carry out next reaction；3rd step：Oxygen and upper is filled with into the 3rd reactor The ethene prepared is stated, so that ethene, oxygen and hydrogen chloride gas precursor reactant generation dichloroethanes, hydrogen chloride gas is consumed Fall, specific reaction equation is CH2=CH2+HCl+O2→ClCH2CH2Cl+H2O；
Prepare polyvinyl chloride：Vinyl chloride is passed through into the 4th reactor, by the temperature control of the 4th reactor at 10 DEG C, Peroxy initiator is added at the same time to trigger chloroethylene polymerization to generate polyvinyl chloride.
The wherein raw material of synthesizing methanol can also be the oven gas that produces in coal process of coking, the CH in oven gas4And Other hydro carbons carry out partial oxidation and vapor conversion reaction generation methyl methanol syngas, specific reaction equation in conversion stove with pure oxygen For：2H2+O2→2H2O, CH4+H2O→CO+3H2, while the CO in methane and oven gas2Conversion generation methyl methanol syngas, specifically Reaction equation is：CH4+CO2→2CO+2H2, the component of synthesis gas enters synthesizing methanol in methyl alcohol synthetic reactor afterwards after measured, specific anti- Ying Shiwei：CO+2H2→CH3OH, CO2+3H2→CH3OH+H2O。
Wherein the raw material of synthesizing methanol can also be calcium carbide stove exhaust, and calcium carbide stove exhaust transformation system steams part CO and water Gas shift reaction generation generation methyl methanol syngas, with synthesizing methanol, specific reaction equation is：CO+H2O→H2+CO2, the group of synthesis gas Part after measured after, the calcium carbide stove exhaust of a part of transformed process and the calcium carbide stove exhaust without shift conversion step measure gas into After point, meet the synthesis demand of methanol by controlling into the amount of change furnace and the flow of distribution, with synthesizing methanol, specific reaction Formula is：CO+2H2→CH3OH, CO2+3H2→CH3OH+H2O。
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly Enclose, one of ordinary skill in the art will appreciate that realize all or part of flow of above-described embodiment, and will according to right of the present invention Made equivalent variations are sought, still falls within and invents covered scope.

Claims (1)

  1. A kind of 1. method for manufacturing polyvinyl chloride, it is characterised in that：Methanol is prepared by raw material of coal first, then using methanol as original Material prepares ethene, and vinyl chloride is made by oxychlorination balancing method in ethene, then generates polyvinyl chloride by vinyl chloride sudden reaction；
    Specific preparation process comprises the following steps：
    Prepare methanol：Raw material using dry pulverized coal to prepare methanol, gasification of coal is generated by dry coal powder pressure gasifying, then by gasification of coal with Pure oxygen is passed through to gasification furnace and carries out oxidation reaction, and generation contains CO and H2Unpurifed gas, specific reaction equation is：CmHnSr+m/2O2→ mCO+[n/(2-r)]H2+rH2S；Part unpurifed gas is taken to pass through CO shift conversion steps, to adjust the ratio of CO in unpurifed gas, tool Vivo reaction type is：CO+H2O→H2+CO2, make CO and H in gasification furnace2Ratio is 1:2~1:Between 4；Then unpurifed gas is led to Enter in desulfuration absorbing tower with by the H in unpurifed gas2S gases remove, and contain methanol in desulfuration absorbing tower, can be by thick water coal Acid gas adsorption in gas, CO and H2Through desulfuration absorbing tower be directed into the methanol reactor added with copper-based catalysts with Synthesizing methanol, synthesis pressure are 3MPa~10MPa, and synthesis temperature is 150 DEG C~350 DEG C, and the reaction equation of synthesizing methanol is：CO+ 2H2→CH3OH, CO2+3H2→CH3OH+H2O；
    Prepare ethene：Ethene is prepared by raw material of methanol obtained above, methanol prepares ethene and is divided into two stages, the first rank Section：First methanol is passed through into the first reactor containing metal-zeolitic dual-function catalyst so that methanol turns with high selectivity Dimethyl ether is turned to, specific reaction equation is 2CH3OH→CH3OCH3+H2O；Second stage：By the dimethyl ether of generation be passed through to containing In the second reactor of SAPO-34 molecular sieve catalysts so that dimethyl ether in high selectivity be converted into containing ethene, propylene and its The mix products of his low-carbon alkene, reaction equation 2CH3OCH3→2CH2=CH2+2H2O, then mix products are sent to separation of olefins The isolated ethene of unit；Prepare vinyl chloride：It is divided into three steps, the first step：Ethene obtained above is passed through to first reactor In, while chlorine is passed through into first reactor, so that with chlorine addition reaction generation dichloroethanes, ethene and chlorine occur for ethene The addition molar ratio of gas is 1:1~2:1, specific reaction equation is：
    CH2=CH2+Cl2→ClCH2CH2Cl；Second step：The dichloroethanes of generation is directed into second reactor, while to Two reactors heat up, and make the temperature of second reactor at 400 DEG C -700 DEG C, so that dichloroethanes is thermally cracked to produce vinyl chloride and chlorine Change hydrogen, specific reaction equation is：ClCH2CH2Cl→CH2=CHCl+HCl, HCl is isolated, and the HCl gases isolated are directed into To carry out next reaction in 3rd reactor；3rd step：Oxygen and the above-mentioned ethene prepared are filled with into the 3rd reactor, with Make ethene, oxygen and hydrogen chloride gas precursor reactant generation dichloroethanes, hydrogen chloride gas is consumed, specific reaction equation is
    CH2=CH2+HCl+O2→ClCH2CH2Cl+H2O；
    Prepare polyvinyl chloride：Vinyl chloride is passed through into the 4th reactor, by the temperature control of the 4th reactor 10 DEG C~100 DEG C, while peroxy initiator is added to trigger chloroethylene polymerization to generate polyvinyl chloride.
CN201711146869.7A 2017-11-17 2017-11-17 The method for manufacturing polyvinyl chloride Pending CN107936157A (en)

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CN109456431A (en) * 2018-10-11 2019-03-12 青海省矿业集团股份有限公司 A kind of polyolefin cleaning loop production method and system

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CN106866329A (en) * 2017-01-22 2017-06-20 江苏天诺新材料科技股份有限公司 The preparation method of low-carbon alkene

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