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Method for producing diisobutylene by using mixed C4

A technology of diisobutene and isobutene, applied in the field of C4 polymerization, can solve the problems of difficult recovery of inhibitors, high trimer content, low diisobutene content, etc., and achieves the effects of simple recovery method, low energy consumption and simplified process

Active Publication Date: 2020-02-07
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

CN1087616A discloses a multi-stage fixed-bed series polymerization process of mixed carbon four. The raw materials pass through two or more series reactors successively, and the reaction catalyst is aluminum silicate pellets. The polymerization reaction is controlled by the reaction temperature. Since there is no addition of polymerization Reaction inhibitors also make the content of trimers in the reaction products higher, and the content of dimers and C8 can only reach more than 65%
The above technologies either do not add inhibitors, or the added inhibitors are water, alcohols or ethers, the content of diisobutylene in the polymerization product is not high, or the inhibitors are not easy to recycle

Method used

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  • Method for producing diisobutylene by using mixed C4
  • Method for producing diisobutylene by using mixed C4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] use as figure 1 Catalytic distillation process;

[0036] Mixed C4 contains 18.5% isobutene and 16.3% n-butene, feed rate: 300g / h;

[0037] Fixed-bed polymerization reactor catalyst loading: 500ml, the catalyst is a macroporous sulfonic acid cation exchange resin, and the exchange capacity is 4.5mmol [H+] / g; the preparation method of the polymerization catalyst comprises the following steps:

[0038] (1) Add 0.2g of hydroxypropylmethylcellulose, 0.3g of polyacrylamide, and 7g of sodium secondary alkyl sulfonate to 500g of water, heat and stir to dissolve completely and form a uniform aqueous solution. Then add the organic phase mixture composed of 90g styrene, 35g divinylbenzene, 0.9 gram benzoyl peroxide, 24g n-hexadecane, 6g tert-butyl neodecanoate, adjust the appropriate stirring speed, and heat up to 65°C, constant temperature reaction for 2 hours, then raise the temperature to 80°C, constant temperature reaction for 4 hours. The reaction product was filtered, the...

Embodiment 2

[0046] use as figure 1 Catalytic distillation process;

[0047] Mixed C4 contains 18.5% isobutene and 16.3% n-butene, feed rate: 300g / h;

[0048] Fixed-bed polymerization reactor catalyst loading: 300ml, catalyzer is macroporous sulfonic acid cation exchange resin, exchange capacity is 5.0 mmol [H+] / g, its preparation method is the same as the preparation method of polymerization catalyst among the embodiment 1, difference is: to Add 4g of hydroxypropylmethylcellulose, 0.3g of polyacrylamide, and 2g of sodium secondary alkylsulfonate to 450g of water, heat and stir to dissolve completely, forming a uniform aqueous solution. An organic phase mixture consisting of 60 g of styrene, 40 g of divinyltoluene, 3 g of benzoyl peroxide, 40 g of liquid paraffin, and 0.6 g of tert-butyl neodecanoate was added.

[0049] Catalytic distillation tower catalyst loading: 200ml;

[0050] Add polymerization inhibitor in the raw material, the mol ratio of inhibitor and isobutylene in the fresh ...

Embodiment 3

[0055] use as figure 1 Catalytic distillation process;

[0056] Mixed C4 contains 18.5% isobutene and 16.3% n-butene, feed rate: 300g / h;

[0057] Fixed-bed polymerization reactor catalyst load: 400ml, catalyzer is macroporous sulfonic acid cation exchange resin, and exchange capacity is 5.5mmol [H+] / g, and its preparation method is the same as the preparation method of polymerization catalyst among the embodiment 1, difference is: to Add 0.4g of hydroxypropyl methylcellulose, 6g of polyacrylamide, and 1g of sodium secondary alkylsulfonate to 500g of water, heat and stir to dissolve completely and form a uniform aqueous solution. Then add the organic phase mixture composed of 80g styrene, 30g divinyl toluene, 1.5 gram benzoyl peroxide, 33g n-dodecane, 4g tert-butyl peroxyneodecanoate;

[0058] Catalytic distillation tower catalyst loading: 200ml;

[0059] A polymerization inhibitor is added to the raw material, and the molar ratio of the inhibitor to isobutylene in the fresh...

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Abstract

The invention provides a method for producing diisobutylene by using mixed C4, and belongs to the technical field of C4 polymerization. The method is characterized by comprising the following steps: performing a polymerization reaction on the mixed C4 in the presence of a catalyst and an inhibitor, wherein the temperature of the polymerization reaction is 20-140 DEG C, the reaction pressure is 0.2-4.0 MPa, the mixed C4 contains 1%-99.99% of isobutene, the catalyst is macroporous sulfonic acid cation exchange resin, the exchange capacity (based on H<+>) of the macroporous sulfonic acid cation exchange resin is 4.0-5.5 mol / g, the airspeed is 0.2-8 h<-1>, the inhibitor is a mixture of acetone and butanone, and the molar ratio of the inhibitor to the isobutene in the mixed C4 is (0.003-1.5):1;and performing separation on the polymerized product after the polymerization reaction to obtain the diisobutylene, and after the polymerization reaction is completed, performing distillation to recover the inhibitor. The method realizes high-conversion high-selectivity dimerization and greatly improves the yield of the diisobutylene, and the inhibitor does not participate in the reaction and iseasy to recover and recycle.

Description

technical field [0001] The invention discloses a method for producing diisobutylene by mixing C4, which belongs to the technical field of C4 polymerization. Background technique [0002] The main components of diisobutene (diisobutene) are 2, 4, 4-trimethyl-1-pentene and 2, 4, 4-trimethyl-2-pentene. It is a colorless and transparent liquid, volatile. As a valuable chemical raw material, diisobutene has been paid more and more attention by people. It can be used to produce various fine chemical products such as octylphenol, isononanol and octyldiphenylamine. Diisobutene reacts with phenol to form octylphenol. The latter is an important fine chemical product and the basic raw material for the synthesis of surfactants, antioxidants, stabilizers, resins, etc. [0003] A large amount of mixed C4 is produced during petroleum processing, which contains 1% to 99.99% isobutene. The isobutene in the raw material is polymerized to form a polymer product. The main component is diisob...

Claims

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Application Information

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IPC IPC(8): C07C2/28C07C11/02
CPCC07C2/28C07C2531/08C07C11/02Y02P20/10
Inventor 吕爱梅侯磊杨忠梅孟宪谭李玉田张敏
Owner CHINA PETROLEUM & CHEM CORP
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