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A kind of alkylation method

A technology of alkylation and alkylation reaction, which is applied in the field of alkylation, can solve the problems such as the decrease of alkylbenzene selectivity, achieve the effects of high ethylbenzene selectivity, reduce energy consumption, and ease the reaction conditions

Active Publication Date: 2018-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the lower the reaction temperature, the more conducive to improving the selectivity of alkylbenzene, but the examples provided by ZL01144957.8 have a reaction temperature above 200°C, and the selectivity of alkylbenzene decreases significantly as the styrene-ene ratio decreases.

Method used

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  • A kind of alkylation method
  • A kind of alkylation method
  • A kind of alkylation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0068] Preparation of conventional β molecular sieves: add sodium metaaluminate solution (sodium oxide 145.8g / L, aluminum oxide 102.8g / L), tetraethylammonium hydroxide (TEAOH, 2.417N, Guangzhou Dayou Fine Chemical Co., Ltd.) into deionized Heat to dissolve in water, stir evenly to make a working solution, mix coarse-porous silica gel (150-250μm, 500m 2 / g, 0.9mL / g, Qingdao Ocean Chemical Factory) mixed with the above working solution, so that the surface of the silica gel is wetted by the working solution to obtain a reaction mixture, wherein the molar ratio of each component is SiO 2 / Al 2 o 3 =20,Na 2 O / SiO 2 =0.075, TEAOH / SiO 2 =0.09,H 2 O / SiO 2 = 6.5. The reaction mixture was crystallized in a high-pressure reactor at 120°C for 24 hours, and then crystallized at 140°C for 48 hours. After cooling to room temperature, the solid product was separated, washed, and dried at 110°C to obtain SiO 2 / Al 2 o 3 (Molar ratio)=20 beta molecular sieve raw powder, D value is 1....

Embodiment 1

[0073] as previously stated figure 1 Alkylation is carried out according to the technical process, and the alkylation catalyst used is the catalyst A of the preparation example. In addition, the production of alkylbenzene (ethylbenzene) also includes transalkylation reaction and product rectification (flow process is not drawn), and the transalkylation catalyst that uses is AEB-1 type catalyst, and following embodiment is identical:

[0074] After the raw material benzene from pipeline 35 is mixed with the alkylbenzene from pipeline 36 and the part of ethylene coming through pipelines 31 and 32 successively, it enters the first reaction zone 45 through pipeline 37 and reacts to generate alkylbenzene (comprising ethylbenzene, polybenzene, Ethylbenzene), the first reaction zone 45 has 2 sections of catalyst beds, and each section introduces ethylene through pipelines 31,32. Part (30% by weight) of the reaction product in the first reaction zone is led to the inlet of the first ...

Embodiment 2

[0079] as previously stated figure 2 The process flow for alkylation:

[0080] From the raw material benzene of pipeline 135 and from the alkylbenzene of pipeline 136, and the part of impure low-carbon olefins (its main composition (weight %) coming through pipeline 131,132 successively: hydrogen 2.99, nitrogen 36.34, oxygen 1.74, CO 1.7 , CO 2 7.67, methane 16.64, ethane 13.91, ethylene 18.33, propylene 0.07, C40.01) mixed, enter the first reaction zone 145 through the pipeline 137 to react to generate alkylbenzene (including ethylbenzene, polyethylbenzene). The first reaction zone 145 has two stages of catalyst beds, and each stage introduces impure light olefins through pipelines 131 and 132. The effluent 138 from the first reaction zone is mixed with the alkylbenzene from the pipeline 136A and part of the impure light olefins from the pipelines 131 and 133 sequentially, and enters the second reaction zone 146 through the pipeline 139 to react and generate alkylbenzene. ...

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Abstract

The invention provides an alkylation method, which comprises: under the alkylation reaction conditions, contacting an olefin source, a benzene source and an alkylation catalyst in an alkylation reactor, wherein the alkylation The reactor includes at least one reaction zone, wherein the initial reaction temperature of at least one of the reaction zones following the first reaction zone is lower than the initial reaction temperature of the first reaction zone by more than 10°C. The present invention adopts the mode of partition reaction and part or all cooling to improve the selectivity of the target product alkylbenzene; the conversion rate of raw material olefin in the method of the present invention is greater than 99%, and the selectivity of generating alkylbenzene reaches more than 99%, and There are few impurities in the product, for example, the xylene content in the ethylbenzene product can be less than 10ppm.

Description

technical field [0001] The present invention relates to an alkylation process. Background technique [0002] Alkylbenzenes are widely used as intermediate products, especially ethylbenzene and cumene. Cumene is the raw material for the production of phenol and acetone. Although the demand for phenol and acetone is not as high as that of styrene, it is also an important basic organic chemical raw material. [0003] It has been predicted that the consumption of cumene in the world will grow at an average annual rate of about 4.6%, while the consumption of Asia-Pacific countries and regions except Japan will reach an average annual growth rate of about 12.5%. Ethylbenzene is the raw material for the production of styrene, and the production of styrene by catalytic dehydrogenation of ethylbenzene accounts for about 90% of its production capacity. Styrene is an important monomer for the synthesis of polymer materials. In my country, styrene is mainly used in the production of P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66C07C15/073C07C15/02B01J29/70
CPCY02P20/52
Inventor 王瑾余少兵舒兴田郭湘波张凤美慕旭宏
Owner CHINA PETROLEUM & CHEM CORP
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