Linear alkylbenzene production process and linear alkylbenzene production device

A technology for the production of straight-chain alkylbenzenes, which is applied in the production of bulk chemicals, chemical industry, sustainable manufacturing/processing, etc., and can solve the problems of increasing operational difficulty and energy consumption, short catalyst operation period, high reaction temperature and pressure, etc. problems, to achieve the effects of low production cost, easy regeneration and recycling, and high selectivity

Pending Publication Date: 2019-07-12
NANJING CHEM CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the HF acid process, the catalytic reaction conditions of Detal are relatively harsh (the reaction temperature and pressure are relatively high, and the benzene cycle ratio is relatively large), and the energy consumption and material consumption are relatively high, which makes it at a disadvantage in the comparison of the components of the total product cost; Detal The catalyst life of the process is only 24 hours, and there are defects of rapid deactivation, which leads to short operation period of the catalyst and requires frequent regeneration
In order to maintain the liquid-solid reaction, a higher operating pressure (3.5MPa) is required, which increases the difficulty of operation and energy consumption

Method used

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  • Linear alkylbenzene production process and linear alkylbenzene production device
  • Linear alkylbenzene production process and linear alkylbenzene production device
  • Linear alkylbenzene production process and linear alkylbenzene production device

Examples

Experimental program
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Effect test

preparation example Construction

[0109] Optionally, the preparation method of the solid acid catalyst comprises:

[0110] Add binder and 0.5-0.6mol / L HNO to the catalyst (molecular sieve) 3 Mix evenly to shape the catalyst, and the molding process is carried out according to the conventional method;

[0111] Place the shaped catalyst in an oven and dry it at 60-120°C for 1-10 hours, and then bake it in a muffle furnace at 400-700°C for 1-10 hours;

[0112] Under the pressure of 0.1-0.5MPa (g), use 100% water vapor (mass space velocity of water 1-6h) in the tubular fixed-bed reactor -1 ) treating the catalyst at 400-600° C. for 2-20 hours, and drying at 100-150° C. for 5-10 hours to obtain the solid acid catalyst used in the alkylbenzene production process of the present invention.

[0113] Usually, the alkylation reaction between linear olefins and benzene will produce various linear alkylbenzene isomers such as 2-LAB, 3-LAB, 4-LAB, 5-LAB and so on. Among them, 2-LAB has a long "tail" during sulfonation, w...

Embodiment 1

[0131] The linear olefins used in Example 1 are C8 linear olefins.

[0132] The inner diameter of the linear alkylbenzene reactive distillation tower 10 is 50mm, and the height is 3000mm, wherein the height of the first rectification section 11 is 150mm, and the height of the reaction section 12 is 1200mm, and the first stripping section The height of 13 is 1650mm.

[0133] During the entire alkylbenzene production process, the ratio of the total amount of benzene added to the linear alkylbenzene reactive distillation column 10 as production raw materials to the total amount of linear olefins is 1.05:1.

[0134] The reaction conditions and results are shown in Table 1. The results show that the mass proportion of C8 linear alkylbenzene in the reaction product reaches more than 95%, and in the linear alkylbenzene, the mass proportion of 2-LAB is greater than 50%. 3 -The mass proportion of LAB is greater than 35%.

[0135] Table 1 Example 1 reaction conditions and reaction res...

Embodiment 2

[0138] The linear olefins used in Example 2 are C12 linear olefins.

[0139] The inner diameter of the linear alkylbenzene reactive distillation tower 10 is 60mm, and the height is 3000mm, wherein the height of the first rectifying section 11 is 240mm, and the height of the reaction section 12 is 1260mm, and the first stripping section 13 has a height of 1500mm.

[0140] During the entire alkylbenzene production process, the ratio of the total amount of benzene added to the linear alkylbenzene reactive distillation column 10 as production raw materials to the total amount of linear olefins is 1.08:1.

[0141] The reaction conditions and results are shown in Table 2. The results show that the mass proportion of C12 linear alkylbenzene in the reaction product reaches more than 95%, and in the linear alkylbenzene, the mass proportion of 2-LAB is greater than 50%. -The mass proportion of LAB is greater than 35%.

[0142] Table 2 embodiment 2 reaction conditions and reaction resu...

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Abstract

The invention discloses a linear alkylbenzene production process and a linear alkylbenzene production device. A reaction rectification mode is adopted to carry out alkylbenzene reaction, the alkylbenzene reaction is exothermic reaction, the heat emitted by the reaction can be used as a rectification heat source, full utilization of process energy is realized, and accordingly the production energyconsumption is reduced. In addition, the heat generated by the alkylation reaction is absorbed by rising airflow, and a catalyst can be prevented from being sintered and thus the activity is reduced due to the fact that the temperature of the reaction section is too high. The catalyst adopted in the linear alkylbenzene production process is a solid acid catalyst, is non-corrosive to reaction devices, and is easy to regenerate and recover. In the production process, reaction and rectification occur simultaneously, reaction products continuously flow into a linear alkylbenzene separation tower for separation, and it is facilitated that alkylation reaction is carried out in the forward direction. In general, the linear alkylbenzene production process is low in energy consumption, low in operation difficulty, the catalyst is long in service life, the linear alkylbenzene conversion rate is high and few reaction by-products are produced.

Description

technical field [0001] The invention relates to the technical field of alkylbenzene production, in particular to a linear alkylbenzene production process and linear alkylbenzene production equipment. Background technique [0002] Linear alkylbenzene (LAB) is an important aromatic organic chemical raw material, linear alkylbenzene (LAB) can be used to generate linear alkylbenzene sulfonic acid (LAS), LAS has now become a household and industrial detergent the most important raw material. [0003] LAB is produced by the alkylation of benzene and linear olefins in the liquid phase, which belongs to the traditional Friedel-Crafts type reaction, mainly using AlCl 3 , BF 3 、H 2 SO 4 、H 3 Lewis acids such as PO4 and HF are used as catalysts. The most widely used in industry is the HF process, while the traditional HF, AlCl 3 Such liquid acid catalysts seriously corrode equipment and pollute the environment during the production process, and the products and catalysts are not...

Claims

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Application Information

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IPC IPC(8): C07C2/70C07C7/04C07C15/107
CPCC07C2/70C07C7/04C07C15/107Y02P20/52Y02P20/10
Inventor 陈锡武陈鉴解委托
Owner NANJING CHEM CHEM TECH CO LTD
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