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Method for simultaneously synthesizing methyl-ethylbenzene and diethylbenzene by virtue of one-step method

A technology of diethylbenzene and methylethylbenzene, which is applied in the field of chemical synthesis, can solve the problems of high production cost, cumbersome process, and low conversion rate of benzene, and achieve the effects of low cost, fast and simple process, and convenient and fast reaction process

Inactive Publication Date: 2016-06-01
JIANGSU EVERGREEN NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, two-step reactions have been experienced, the process is cumbersome, the conversion rate of benzene is not high, and the production cost is also high, especially the by-product diethylbenzene in the reaction of benzene and ethylene to prepare ethylbenzene is directly used as waste , which not only leads to an increase in cost, but also wastes resources

Method used

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  • Method for simultaneously synthesizing methyl-ethylbenzene and diethylbenzene by virtue of one-step method
  • Method for simultaneously synthesizing methyl-ethylbenzene and diethylbenzene by virtue of one-step method
  • Method for simultaneously synthesizing methyl-ethylbenzene and diethylbenzene by virtue of one-step method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1: This example provides a method for simultaneously synthesizing methylethylbenzene and diethylbenzene in one step. The raw materials are benzene, toluene and ethylene, and the ratio of benzene and toluene is 1:1. The method includes a pretreatment stage, a reaction stage and posttreatment stage, the specific steps are as follows:

[0038] (1) Preprocessing stage:

[0039] a) Benzene and toluene are heated up to 130°C through a benzene-toluene heat exchanger, then enter a benzene-toluene gasifier, and enter a heating furnace to be heated to 390°C after gasification;

[0040] b) Put ethylene into the ethylene vaporizer and heat up to 22°C;

[0041] The feed ratio of ethylene to benzene and toluene is 14, wherein the total amount of benzene and toluene includes the part where the mixture of benzene, toluene and ethylbenzene in the subsequent benzene and toluene recovery system enters the benzene and toluene gasifier;

[0042] (2) Reaction stage:

[0043] Pass ...

Embodiment 2

[0052] This embodiment provides a one-step method for simultaneously synthesizing methylethylbenzene and diethylbenzene. The only difference from Example 1 is that the composition ratio of the raw materials and the reaction parameters are slightly different. The raw materials are benzene, toluene and ethylene, and the ratio of benzene to toluene is 1:1.5, the method includes a pretreatment stage, a reaction stage and a postprocessing stage, and the specific steps are as follows:

[0053] (1) Preprocessing stage:

[0054] a) Heating benzene and toluene to 120°C through a benzene-toluene heat exchanger, entering a benzene-toluene gasifier, and entering a heating furnace to heat to 350°C after gasification;

[0055] b) Put ethylene into the ethylene vaporizer and heat up to 18°C;

[0056] The feed ratio of ethylene to benzene and toluene is 17, wherein the total amount of benzene and toluene includes the part where the mixture of benzene, toluene and ethylbenzene in the subseque...

Embodiment 3

[0067] This embodiment provides a one-step method for simultaneously synthesizing methylethylbenzene and diethylbenzene. The only difference from Example 1 is that the composition ratio of the raw materials and the reaction parameters are slightly different. The raw materials are benzene, toluene and ethylene, and the ratio of benzene to toluene is 1:2, the method includes a pretreatment stage, a reaction stage and a postprocessing stage, the specific steps are as follows:

[0068] (1) Preprocessing stage:

[0069] a) Heating benzene and toluene to 140°C through a benzene-toluene heat exchanger, entering the benzene-toluene gasifier, and entering a heating furnace to heat to 430°C after gasification;

[0070] b) Put ethylene into the ethylene vaporizer and heat up to 23°C;

[0071] The feed ratio of ethylene to benzene and toluene is 20, wherein the total amount of benzene and toluene includes the part where the mixture of benzene, toluene and ethylbenzene in the subsequent b...

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Abstract

The invention relates to a method for simultaneously synthesizing methyl-ethylbenzene and diethylbenzene by virtue of a one-step method. Ethylene, benzene and methylbenzene are taken as raw materials to perform an alkylation reaction so as to synthesize methyl-ethylbenzene and diethylbenzene in one step. The method comprises a pretreatment stage, a reaction stage and an aftertreatment stage. In the method, one reaction system is adopted, and alkylation reaction and aftertreatment are sequentially performed so as to separate components, so that target products are obtained, and thus one-step simultaneous synthesis of methyl-ethylbenzene and diethylbenzene is realized; the problem that two independent devices are respectively used for production in a traditional production process is avoided, and the whole reaction process is convenient and rapid; the yields of different components can be effectively adjusted by adjusting different proportions of raw materials, and unreacted benzene and methylbenzene and the ethylbenzene generated in a reaction process are separated and recycled to serve as raw materials once again, so that the production cost is greatly saved, and meanwhile, the method can adapt to variations of the market to the greatest extent.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a production method for simultaneously producing diethylbenzene and methylethylbenzene by using toluene, benzene and ethylene as raw materials for alkylation reaction. Background technique [0002] Traditionally, the typical production of diethylbenzene and methylethylbenzene uses an independent production device, which is divided into two units: reaction and fractionation. High-purity ethylbenzene and toluene are used as raw materials to react with ethylene respectively. The two devices cannot replace each other. Therefore, not only two sets of independent devices are required in the production process, the production cost is high, and the conversion rate is not high, but also the pretreatment, reaction and post-treatment of the product are also required in the production process, the production process is cumbersome, time-consuming and laborious , resource energy consumption i...

Claims

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Application Information

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IPC IPC(8): C07C2/66C07C7/04C07C15/02
CPCY02P20/52C07C2/66C07C7/04C07C2529/40C07C15/02
Inventor 孙秋新
Owner JIANGSU EVERGREEN NEW MATERIAL TECH
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