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Method for synthesizing cyclohexylbenzene by using fixed bed

A technology of cyclohexylbenzene and fixed bed, which is applied in the chemical industry and can solve the problem of low selectivity of cyclohexylbenzene

Active Publication Date: 2019-11-22
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalysts developed in the early stage have the problem of low selectivity of cyclohexylbenzene. For example, ExxonMobil has developed catalysts supporting hydrogenation metals based on MCM-22 series molecular sieves (US2011 / 0015457 A1, US2011 / 0021841 A1), which are used for the hydrogenation of benzene Synthesis of cyclohexylbenzene, this technology produces more by-product cyclohexane

Method used

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  • Method for synthesizing cyclohexylbenzene by using fixed bed
  • Method for synthesizing cyclohexylbenzene by using fixed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of hydroalkylation catalyst

[0034] At room temperature, weigh a certain amount of RuCl 3 ·3H 2 Dissolve O in deionized water, add molecular sieves, stir for 10 minutes, heat up to 60°C, add 10% ammonium carbonate solution dropwise, stop dropping when pH>8, stir for 30 minutes, measure pH value, if pH 8, then stirred for 30 min, and measured the pH value, and so on until pH > 8, and then continued to stir for 2 h. Filtration, washing, drying, roasting, tablet forming, sieving, and standby.

[0035] (2) Preparation of transalkylation catalyst

[0036] Weigh 30g of USY molecular sieve with a silicon-aluminum ratio of 12, add 120g of citric acid aqueous solution with a mass concentration of 2%, treat at 80°C for 4h, filter, wash, dry, roast at 580°C for 4h, press into tablets, sieve, and set aside.

[0037] (3) Reaction process

[0038] Firstly, the hydroalkylation catalyst and the transalkylation catalyst were loaded respectively, and the two ends of ...

Embodiment 2

[0044] Catalyst preparation is the same as in Example 1.

[0045] reaction process

[0046] Firstly, the hydroalkylation catalyst and the transalkylation catalyst were loaded respectively, and the two ends of the hydroalkylation reaction tube and the transalkylation reaction tube were respectively filled with quartz sand, and the loading amount of the catalyst was 4 g. The hydroalkylation catalyst is reduced, and the reduction temperature is 250°C. Hydroalkylation reaction conditions: benzene space velocity is 2.0h -1 , the reaction temperature is 180°C, the reaction pressure is 2.0MPa, and the molar ratio of hydrogen to benzene is 0.6. Transalkylation reaction conditions: reaction temperature 240°C, reaction pressure 2.0MPa. After 24 hours of reaction, samples were taken and analyzed. The mass percentages of cyclohexane, benzene, cyclohexylbenzene and dicyclohexylbenzene in the second stream and the third stream are shown in Table 1.

[0047] Table 1

[0048]

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Abstract

The invention discloses a method for synthesizing cyclohexylbenzene by using a fixed bed. The method comprises two reaction steps, wherein the two reactions are respectively a hydroalkylation reactionand a transalkylation reaction; benzene and hydrogen are used as raw materials and passthrough a hydroalkylation reactor to obtain a first material flow; the hydrogen in the first material flow leaves the reaction system through the gas-liquid separator to obtain a second material flow; wherein the content of cyclohexylbenzene in the second material flow is 34-37%, the second material flow completely enters an alkyl transfer reactor without any separation operation; then a final third material flow is obtained through an alkyl transfer reaction, and the content of cyclohexylbenzene in the third material flow is not lower than 40%. According to the method for synthesizing cyclohexylbenzene provided by the invention, the yield of the product is effectively improved, and after the step of the hydroalkylation reaction, the materials can be directly subjected to the transalkylation reaction without a separation step, so that the separation operation before the transalkylation reaction isomitted, and the purposes of simplifying the operation and reducing the cost are achieved.

Description

technical field [0001] The invention relates to a method for synthesizing cyclohexylbenzene by using a fixed bed, which belongs to the technical field of chemical industry. Background technique [0002] Phenol is an important chemical product and is used as the main raw material for the production of phenolic resins, bisphenol A, caprolactam, adipic acid and plasticizers. Currently, the most common route for the production of phenol is the Hock process, a three-step process that begins with the alkylation of benzene with propylene to produce cumene, followed by oxidation of the cumene to the corresponding hydroperoxide, The hydroperoxide is then cleaved to produce equimolar amounts of phenol and acetone. But the current demand for phenol is growing faster than acetone, and the cost of propylene is also increasing due to insufficient development. [0003] The preparation of phenol from cyclohexylbenzene is an emerging technology, advantageous in that it co-produces cyclohex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/66C07C13/28C07C5/10C07C13/18B01J29/74B01J29/22B01J37/03B01J31/02B01J29/12
CPCC07C2/66C07C5/10B01J29/7415B01J29/7476B01J29/22B01J37/031B01J29/126B01J31/0274C07C2601/14B01J2229/18C07C13/28C07C13/18Y02P20/52
Inventor 孙红影王岩王贤彬王炳春李进
Owner CHINA CATALYST HLDG CO LTD
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