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Technology for producing diisobutylene from C4 mixture

A technology of mixing carbon tetra and diisobutene, which is applied in the chemical industry, hydrocarbons, hydrocarbons, etc., can solve the problems of complex process, increase energy consumption, reduce isobutene concentration, etc., achieve high reaction selectivity and reduce investment. , the effect of saving energy

Active Publication Date: 2017-12-15
CHINA PETROLEUM & CHEM CORP
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  • Abstract
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  • Application Information

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Problems solved by technology

The disadvantage of this process is that the process is more complicated
Generally, the reacted product or inert C4 is partially cooled and returned to the reactor after being mixed with fresh materials to control the reaction temperature and eliminate the hot spots of the reaction, but this also reduces the concentration of isobutene in the raw materials and reduces the driving force of the reaction. Yes, the loading amount of the catalyst has increased, and the heat of reaction has not been effectively utilized, but the energy consumption has increased

Method used

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  • Technology for producing diisobutylene from C4 mixture

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] see figure 1 In the process flow shown, the D006 type macroporous strong acid cation exchange resin is used as the catalyst for the dimerization reaction, at a pressure of 0.60MPa, a temperature of 60°C, an addition of tert-butanol of 1% of the amount of mixed carbon tetra, and a space velocity of 0.90 h -1 Under the condition of , the polymerization reaction was carried out, the conversion rate of isobutene was 94%, and the selectivity of diisobutene was 99.2%. The reacted material enters the rectification tower to continue the separation of reactants and products. Under the conditions of a pressure of 0.40Mpa and a reflux ratio of 2.2, the unreacted mixed carbon four is discharged from the top of the tower, and the diisobutylene product with high purity (≥99.2%) is obtained in the tower reactor.

Embodiment 2

[0039] see figure 1 In the process flow shown, the D006 type macroporous strong acid cation exchange resin is used as the catalyst for the dimerization reaction, at a pressure of 0.50MPa, a temperature of 50°C, an addition of tert-butanol is 0.7% of the amount of mixed carbon four, and a space velocity of 1.20 h -1 Under the conditions of the polymerization reaction, the conversion rate of isobutene is 92.5%, and the selectivity of diisobutene is 99.3%. The reacted material enters the rectification tower to continue the separation of reactants and products. Under the conditions of a pressure of 0.40Mpa and a reflux ratio of 1.5, the unreacted mixed carbon four is discharged from the top of the tower, and a diisobutylene product with high purity (≥99.1%) is obtained in the tower reactor.

Embodiment 3

[0041] see figure 1 In the process flow shown, the D006 type macroporous strong acid cation exchange resin is used as the catalyst for the dimerization reaction, at a pressure of 0.40 MPa, a temperature of 40°C, an addition of tert-butanol of 2% of the amount of mixed carbon four, and a space velocity of 2.0 h -1 Under the conditions of the polymerization reaction, the conversion rate of isobutene is 91%, and the selectivity of diisobutene is 99.3%. The reacted material enters the rectification tower to continue the separation of reactants and products. Under the conditions of a pressure of 0.35Mpa and a reflux ratio of 2.0, the unreacted mixed carbon four is discharged from the top of the tower, and a diisobutylene product with high purity (≥99.3%) is obtained in the tower reactor.

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Abstract

The invention belongs to the technical field of chemical synthesis, and specifically relates to a technology for producing diisobutylene from a C4 mixture. The technology comprises: pumping a C4 mixture and tert-butyl alcohol by a metering pump to a static mixer for mixing, performing pre-heating, allowing the obtained product to enter a fixed bed reactor, performing a dimerization reaction of isobutene in the function of a resin catalyst in a gas-liquid mixed phase state, allowing a diisobutylene product generated from a reactor outlet to enter a rectifying tower for separation, and obtaining the C4 mixture from the tower top and the diisobutylene product from the column bottom. The technology is low in pressure, high in reaction selectivity, simple in reactor structure, saved in energy consumption of the reactor and rectifying tower, and reduced in investment.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a process for producing diisobutene by mixing carbon four. Background technique [0002] The dimer of isobutylene is a very important organic chemical intermediate, which can be used to produce medium and high olefins that are in short supply in China. Because it contains unsaturated double bonds in its molecule, it has strong reactivity and can undergo self-polymerization or copolymerization reactions. Synthesis reaction or halogenation reaction, alkylation reaction, carbonylation reaction, etc. generate a series of fine chemical intermediates. [0003] The sulfuric acid extraction process was industrialized in foreign countries in the 1960s. By the mid-1980s, this process was still the main source of isobutylene dimer in industry. The oligomer yield of the 45%-65% sulfuric acid extraction process unit of BASF Company does not exceed 1%. The process gene...

Claims

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Application Information

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IPC IPC(8): C07C2/28C07C7/04C07C11/02
CPCC07C2/28C07C7/04C07C11/02Y02P20/10
Inventor 董凌云彭光辉孙丛丛郭岩峰张剑
Owner CHINA PETROLEUM & CHEM CORP
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