Production method for 1-butylene

A production method and technology for butene, applied in the field of butene-2 ​​double bond isomerization butene-1, can solve the problems of short life, poor catalyst stability, low selectivity, etc., and achieve extended carbon capacity and reduced operation. Energy consumption, the effect of reducing the cycle ratio

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of poor catalyst stability, short service life, low yield and low selectivity of the target product in the previous document technology, and provide a new production method of butene-1

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the molar ratio of silicon to aluminum SiO 2 / Al 2 O 3 Prepare a slurry containing silicon, aluminum, template agent (n-butylamine) and water at a ratio of 200, and the molar ratio of raw materials is 150 SiO 2 : Al 2 O 3 : 50 n-butylamine: 17OH-: 200NaCl: 6300H 2 O was stirred at room temperature for 15 hours. Then, it is crystallized at a temperature of 140°C for 50 hours, and then the crystallization solution is washed, dried, and calcined to obtain ZSM-5 molecular sieve. After adding 50 grams of ZSM-5 molecular sieve into 87 grams of 40% (weight) silica gel, the mixture is extruded, dried at 130°C, and calcined at 430°C to prepare a ZSM-5 catalyst.

[0017] Load the above-mentioned ZSM-5 molecular sieve catalyst into a fixed-bed isomerization reactor, using pure butene-2 ​​as raw material, and the space velocity of the isomerization reactor is 0.5 hours -1 , The pressure (gauge pressure) is 1MPa, the reaction temperature is 320°C, the theoretical plate numb...

Embodiment 2

[0019] Refer to the various steps of Example 1 to obtain the molar ratio of silicon to aluminum SiO 2 / Al 2 O 3 It is a 450 ZSM-5 molecular sieve catalyst, using pure butene-2 ​​as the raw material, and the space velocity of the isomerization reactor is 25 hours -1 , The pressure (gauge pressure) is 0.2MPa, the reaction temperature is 200°C, the theoretical plate number of the separation tower is 100, the operating pressure is 0.8MPa, the reflux ratio is 45, and the reaction result when the bottom butene-2 ​​is fully circulated is: butene The single-pass conversion rate of -2 and the yield of butene-1 are 12%, and the total conversion rate of butene-2 ​​and the yield of butene-1 based on the butene-2 ​​raw material are greater than 94%.

Embodiment 3

[0021] According to the steps and operating conditions of Example 1, only change: the molar ratio of silicon to aluminum SiO of the ZSM-5 molecular sieve catalyst 2 / Al 2 O3 Is 30, the reaction temperature is 420℃, and the reaction weight space velocity is 45 hours -1 , The reaction pressure (gauge pressure) is 0.5MPa, the raw material is pure butene-2, the theoretical plate number of the separation tower is 60, the operating pressure is 1.3MPa, the reflux ratio is 40, and the reaction result is when the bottom butene-2 ​​is fully circulated : The single-pass conversion rate of butene-2 ​​and butene-1 yield is 25%, and the total butene-2 ​​conversion rate and butene-1 yield based on butene-2 ​​raw materials are greater than 97%.

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Abstract

The present invention relates to a preparation method for butylene-1; the method is to overcome the shortcoming in the prior technology that: the selectivity of the produced butylene-1 is lower; the benefit ratio is lower; the regeneration period for the catalyzer is much shorter; and the energy consumption is much higher. The steps in turn include: (1) the raw material including butylenes is contacted with a molecule screen catalyzer to produce the first reaction flow with the molar ratio between butylene-2 and butylene-1 closing to the thermodynamics balance value; (b) the first reaction flow enters a separated tower for separating to obtain butylene-1 in the tower top and the second reaction flow including butylene-2 is obtained in the tower bottom; (c) the second reaction flow used as butylene-2 directly or turned back to the difference reaction device to be reacted continually; the method can solve the problem greatly, which can be uses in the industrial production of butylene-1.

Description

Technical field [0001] The invention relates to a method for producing butene-1, in particular to a method for isomerizing butene-1 with butene-2 ​​double bond. Background technique [0002] 1-Butene is a chemically active α-olefin. High-purity 1-butene is mainly used to produce linear low-density polyethylene (LLDPE) comonomers. 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 rapidly growing thermoplastic polymer material in recent years; at the same time, other oligomerization products of 1-butene, such as dimer 1 -Octene and trimer dodecene can not only replace 1-butene to synthesize better LLDPE and HDPE, but also can be used in a large number of automotive and lubricant additives, synthetic detergents, surfactants and plasticizers, Printing and dyeing agents, emulsifiers, etc., have a wide range of uses, and their dosage is increasing year by year. The mar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/08C07C5/25
CPCY02P20/584
Inventor 刘俊涛张惠明钟思青
Owner CHINA PETROLEUM & CHEM CORP
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