Method for preparing vinyl chloride from 1,2-dichloroethane

A dichloroethane production, dichloroethane technology, applied in the direction of dehydrohalogenation preparation, chemical recovery, etc., can solve problems that have not been seen yet, achieve good industrialization prospects, reduce energy consumption, and reduce production costs

Inactive Publication Date: 2011-11-23
TIANJIN DAGU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of using metal-modified SAPO-34 molecular sieve

Method used

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  • Method for preparing vinyl chloride from 1,2-dichloroethane
  • Method for preparing vinyl chloride from 1,2-dichloroethane
  • Method for preparing vinyl chloride from 1,2-dichloroethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 25.7g pseudoboehmite (Al 2 o 3 Content 64.59wt%) is dissolved in 89.2ml deionized water, then adds 2.0g ferric nitrate [Fe(NO 3 ) 3 9H 2 O], add 76.1g phosphoric acid (85wt%) under stirring, then add 18.5g silica sol (SiO 2 Content 30wt%), finally add 49.5g triethylamine, continue to stir until uniform, move the above mixture into the reaction kettle, crystallize in an oven at 190°C for 72 hours, take out the reaction kettle and put it in cold water to cool to room temperature, filter and dry Then calcined at 550° C. for 8 hours to obtain Fe-modified SAPO-34 molecular sieve catalyst. The Fe content is 0.5 wt%.

Embodiment 2

[0017] According to the synthesis steps in Example 1, with 1.3g magnesium nitrate [Mg(NO 3 ) 2 ·6H 2 O] instead of iron nitrate [Fe(NO 3 ) 3 9H 2 O], obtain the SAPO-34 molecular sieve catalyst of Mg modification. The Mg content is 0.8 wt%.

Embodiment 3

[0019] According to the synthesis steps in Example 1, with 1.2g manganese acetate [Mn(CH 3 COO) 2 4H 2 O] instead of iron nitrate [Fe(NO 3 ) 3 9H 2 O] to obtain a Mn-modified SAPO-34 molecular sieve catalyst. The Mn content is 0.9 wt%.

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Abstract

The invention provides a method for preparing vinyl chloride by adopting a SAPO-34 molecular sieve catalyst containing metals for catalytic pyrolysis of 1,2-dichloroethane. The method is characterized in that: the metals comprise Fe, Mg, Zn and Mn; the catalyst reacts at a reaction temperature of 280-400 DEG C under reaction pressure of 0.1-2 MPa, wherein weight space velocity of the 1,2-dichloroethane is 0.2-5h<-1>. According to the present invention, conversion rate of the 1,2-dichloroethane is 55%; selectivity of the vinyl chloride is more than 98%; the catalyst can be recycled repeatedly; due to carrying out reaction at the low temperature, the energy consuming are substantially reduced, the production cost is decreased; the method has a good industrial prospect.

Description

technical field [0001] The invention relates to a method for preparing vinyl chloride by catalytically cracking 1,2-dichloroethane with a SAPO-34 molecular sieve catalyst containing metal elements. Background technique [0002] Vinyl chloride (VCM for short) is a very important chemical raw material, mainly used in the synthesis of polyvinyl chloride resin (PVC) and vinylidene chloride, refrigerants and so on. 99% of the world's vinyl chloride monomer is used to produce polyvinyl chloride. At present, the production processes of vinyl chloride mainly include calcium carbide acetylene method, equilibrium oxychlorination method, direct chlorination of ethylene / oxidation of hydrogen chloride and direct oxychlorination of ethane. The output of VCM produced by the equilibrium oxychlorination method accounts for more than 90% of the total output of VCM, and is the most widely used VCM production method. [0003] The reaction process of the equilibrium oxychlorination method is d...

Claims

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Application Information

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IPC IPC(8): C07C21/06C07C17/25
CPCY02P20/584
Inventor 王滨郭庆昌潘靖刘伟
Owner TIANJIN DAGU CHEM CO LTD
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