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Method for treating organic acid in alkylate

A treatment method and alkylation technology, applied in chemical instruments and methods, organic chemistry, separation methods, etc., can solve problems such as adverse effects of subsequent processes and equipment pipelines, and achieve the effects of reliable effect, reduced investment and simple process.

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the organic acids in the alkylation products in the prior art have adverse effects on subsequent processes and equipment pipelines, and a new treatment method for the organic acids in the alkylation products is provided

Method used

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  • Method for treating organic acid in alkylate
  • Method for treating organic acid in alkylate
  • Method for treating organic acid in alkylate

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The toluene methylation reaction product is sent into a high-temperature injector through a 220° C. insulated pipeline. The organic acids in the toluene methylation reaction product are formic acid, acetic acid and propionic acid, and the organic acid content is 1500 ppm. The high temperature syringe is made of stainless steel. The opening ratio of the spray hole on the alkali liquor inlet nozzle in the high-temperature injector is 22%, and the spray hole diameter is 0.5 mm. Pre-prepared sodium hydroxide solution with a mass concentration of 0.001%, stored in a lye tank, and delivered to a high-temperature syringe at a rate of 5ml / min by a metering pump under a pressure of less than 1.5MPa and a temperature of less than 250°C. In a high-temperature syringe, the methylated product is neutralized by mixing with sodium hydroxide solution. The neutralized alkylation product flows into the condenser, and the condensed oil-water mixture product is sent to the oil-water separ...

Embodiment 2

[0025] The high temperature syringe is made of polytetrafluoroethylene alkoxy resin. The opening rate of the spray hole on the alkali liquor inlet nozzle in the high-temperature injector is 15%, and the spray hole diameter is 0.8 mm. Process the organic acid in the alkylation product with the same operation steps in Example 1, only change the type and content of the organic acid in the alkylation product, the type, content and flow rate of the injected lye. See Table 1 for the processing results.

Embodiment 3～4

[0027] The high temperature syringe is made of polytetrafluoroethylene alkoxy resin. The opening ratio of the spray hole on the alkali liquor inlet nozzle in the high-temperature injector is 19%, and the spray hole diameter is 1 mm. Process the organic acid in the alkylation product with the same operation steps in Example 1, only change the type and content of the organic acid in the alkylation product, the type, content and flow rate of the injected lye. See Table 1 for the processing results.

[0028]

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Abstract

The invention relates to a method for treating organic acid in an alkylate, and mainly solves the problems that in the prior art, the organic acid in the alkylate has unbeneficial influence on later processes and equipment pipelines. Through the adoption of the technical scheme that that the method comprises the following steps: (a) conveying a gas phase alkylate into a high-temperature injector through a heat preservation pipeline, injecting an alkali liquid into the high-temperature injector, enabling the alkali liquid to be in contact with the organic acid in the alkylate in the high-temperature injector to perform an acid-alkali neutralization reaction, (b) discharging the neutralized alkylate from the high-temperature injector, feeding into a condenser, discharging the condensed alkylate from the condenser, and feeding into an oil-water separator, wherein the high-temperature injector comprises a gas phase alkylate inlet, a horn-shaped alkylate channel, an alkali liquid inlet, an alkali liquid and alkylate reaction section and a treated alkylate outlet, the problem is well solved, and the method can be applied into industrial production of benzene methylation or methylbenzene methylation.

Description

technical field [0001] The invention relates to a method for treating organic acids in alkylation products. Background technique [0002] Mixed xylene is one of the important basic chemical raw materials. It mainly contains four components: p-xylene, o-xylene, m-xylene and ethylbenzene. Among them, p-xylene is an important raw material for synthesizing polyester fibers and is mainly used for p-xylene. The production of phthalic acid (PTA) and dimethyl terephthalate is widely used in other fields of medicine, pesticides, dyes and solvents, and its consumption exceeds that of other C8 aromatics. In the current global market demand Under the circumstances, the output was seriously insufficient. Among the industrial triphenyls, toluene has a relatively sufficient source, and its industrial use is not as good as benzene and xylene. However, with the increase in gasoline demand in recent years, the ability of toluene to produce xylene has been limited. Therefore, a new xylene pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/148C07C15/08B01D53/78B01D53/40
Inventor 宋曙光董骞胡慧锋李华英张琳孔德金
Owner CHINA PETROLEUM & CHEM CORP