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Method for improving butene double bond isomerization reaction

A technology of double bond isomerization and reaction selectivity, applied in isomerization hydrocarbon production, chemical instruments and methods, organic chemistry, etc., can solve the problem of low selectivity of the target product and achieve good technical effects

Active Publication Date: 2009-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of low selectivity of the target product existing in the previous document technology, and a new method for improving the selectivity of butene double bond isomerization reaction is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0016] According to the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 Configure a slurry containing silicon, aluminum, template (n-butylamine) and water at a ratio of 200, and the molar ratio of the raw materials is 150SiO 2 : Al 2 o 3 : 50 n-butylamine: 17OH - : 200NaCl: 6300H 2 O was stirred at room temperature for 15 hours. Then crystallize at a temperature of 140° C. for 50 hours, and then wash, dry and roast the crystallization solution to obtain ZSM-5 molecular sieve. Add 50 grams of ZSM-5 molecular sieve to 30 grams of 40% (weight) silica gel and mix, extrude, dry at 130°C, and roast at 430°C to prepare a ZSM-5 catalyst sample.

[0017] Weigh 10 grams of the obtained ZSM-5 catalyst sample and put it into a fixed-bed reactor, pass the butene-1 raw material, at a temperature of 550 ° C, and a weight space velocity of 10 hours -1 , treated under the condition of pressure 0.5MPa for 12 hours, the amount of pre-deposited carbon is 0.08% based on the weight of th...

Embodiment 10～19

[0022] According to each step of embodiment 1, silicon aluminum molar ratio SiO is obtained 2 / Al 2 o 3 Be the ZSM-5 type molecular sieve catalyst of 450, carbon content is 1.5%, adopt refinery raffinate II as raw material (by weight percentage, n-butane 17.8%, cis-2-butene 22.2%, trans-2-butene 60%), at a temperature of 320°C and a reaction pressure of 0.1 MPa, the reaction results of isomerization of butene-2 ​​to butene-1 under different reaction space velocity conditions are shown in Table 2:

[0023] Table 2

[0024] serial number airspeed Conversion rate,% selectivity, % 10 0.5 20.21 97.62 11 2.0 20.15 98.56 12 9.41 19.70 98.93 13 14.23 19.39 99.27 14 18.59 19.30 99.55 15 23.58 19.25 99.64 16 35.73 18.97 99.76 17 43.9 18.43 99.83 18 54.38 16.33 99.26 19 100 14.20 99.85

Embodiment 20

[0026] According to the various steps and operating conditions of Example 1, the silicon-aluminum molar ratio SiO 2 / Al 2 o 350 ZSM-5 molecular sieve catalyst with a carbon content of 0.5%, using pure butene-1 as raw material, at a temperature of 100°C and a weight space velocity of 20 hours -1 , under the pressure of 0.1MPa, butene-1 isomerization to butene-2 ​​reaction results: the conversion rate of butene-1 is 88.0%, and the selectivity of butene-2 ​​is 99.01%.

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Abstract

The invention relates to a method for improving reaction selectivity of isomerization of double bonds of butylene. The method mainly solves the problem of poor reaction selectivity in the prior art. Through a technical proposal that butylenes-1, butylenes-2 or a mixture which contains the butylenes-1 and butylenes-2 and does not meet a thermodynamic equilibrium value is used as a raw material; carbon-predeposited aluminosilicate is used as a catalyst, wherein the amount of predeposited carbon is 0.01 to 5 percent counted by the weight of the catalyst; and under the conditions of reaction temperature of between 50 and 480 DEG C, reaction pressure of between -0.08 and 10MPa and weight space velocity of between 0.1 and 100 hours<-1>, the raw material and the catalyst contact and have the isomerization reaction of the double bonds of the butylene to generate an effluent substance with the molar ratio of butylenes-1 to butylenes-2 close to the thermodynamic equilibrium value, and the method well solves the problems and can be applied to industrial production of isomerization of double bonds of butylene.

Description

technical field [0001] The invention relates to a method for improving the selectivity of butene double bond isomerization reaction, in particular to a method for improving the selectivity of butene-2 ​​and butene-1 double bond isomerization reaction to form butene-1. Background technique [0002] 1-butene is a chemically active α-olefin. High-purity 1-butene is mainly used as a comonomer in the production of linear low-density polyethylene (LLDPE). LLDPE has good high-temperature creep properties, High impact strength, heat resistance and wear resistance, especially suitable for hot water pipes, so it has become a thermoplastic polymer material that has grown rapidly in recent years; at the same time, other oligomerization products of 1-butene, such as dimer 1 -Octene and trimer dodecene can replace 1-butene to synthesize better LLDPE and HDPE, and can also be widely used in automotive and lubricating oil additives, synthetic detergents, surfactants and plasticizers, Print...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/08C07C5/25B01J29/06
Inventor 杨为民刘俊涛朱志焱王万民
Owner CHINA PETROLEUM & CHEM CORP
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