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Method for preparing N-methyldiethanolamine

A technology of methyldiethanolamine and methylamine, which is applied in the preparation of organic compounds, the preparation of aminohydroxy compounds, chemical instruments and methods, etc., can solve problems such as multi-environmental protection and cost, raw material consumption, etc., so as to reduce cost consumption, The effect of reducing the consumption of raw materials and reducing the consumption of raw materials

Active Publication Date: 2008-09-17
JIANGSU TAIHU CHEM +1
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the current production process of N-methyldiethanolamine has the technical problems of high raw material consumption, environmental protection and high cost. The present invention provides a production method of N-methyldiethanolamine

Method used

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  • Method for preparing N-methyldiethanolamine
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  • Method for preparing N-methyldiethanolamine

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example 1

[0027] according to figure 1 Shown process flow sheet prepares N-methyldiethanolamine,

[0028] a. Mixing of raw materials: raw materials ethylene oxide, methylamine and circulating fluid are mixed in a mixer, wherein the ratio of ethylene oxide to the total amount of methylamine is 1:2;

[0029] b. Synthesis reaction: transfer the mixed raw materials into the reactor, the internal pressure of the reactor is increased to 6MPa, the temperature is controlled at 135°C, and a mixture containing N-methyldiethanolamine is obtained by the end of the reaction;

[0030] c. Deamination treatment: the pressure will be reduced to 1MPa by the mixture containing N-methyldiethanolamine through the first decompression valve, and the deamination tower used is such as figure 2 The tower body, tower kettle and condenser are shown in the figure. The tower kettle is installed at the lower end of the tower body, through the transition of the conical shell with folded edges. Condenser, the temper...

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Abstract

The invention relates to the technology field of the synthesis of chemical products, in particular to a method of preparing N-methyl diethano lamine. The preparation comprises the following steps that are a. the mixing of raw material; b. synthetic reaction; c. de-amine processing; d. flash evaporation processing; e. absorption treatment; and f. rectification processing, so that N-methyl diethano lamine products are separated. The method solves the technical problems that the raw material consumption is large, the environment protection performance is bad and the cost is high in the production process of the N-methyl diethano lamine at present. The method adopts anhydrous methylamine instead of monomethyl amine water solution so as to lead the MDEA content in the products to be raised from 95 percent to more than 99 percent, the raw material consumption is reduced in a ration way, the unit consumption of epoxy ethane is reduced to reach 0.84 to 0.87 from the original unit consumption that is 0.95 to 1.0, the unit consumption of methylamine is reduced to reach 0.30 to 0.35 from the original unit consumption that is 0.4 to 0.45, and the consumption of the raw material is greatly reduced; all other matters except the products in the technical process of the method are used as raw material for reusing, thereby lowering the cost consumption, and also avoiding the environmental pollution.

Description

technical field [0001] The invention relates to the technical field of chemical product synthesis, in particular to a preparation method of N-methyldiethanolamine. Background technique [0002] N-Methyldiethanolamine is widely used in the removal of carbon dioxide in chemical fertilizer plants, synthetic ammonia plants, and urea production, and in gas refineries, oil refineries, desulfurization of oilfield gas, and sulfur recovery in Claus units. [0003] The existing industrial production method of N-methyldiethanolamine is to use ethylene oxide and excess monomethylamine aqueous solution to react to obtain the mixture of N-methyldiethanolamine and reactants and then separate monomethylamine through flash evaporation Aqueous solution, the N-methyldiethanolamine product is separated by rectification, the content of N-methyldiethanolamine in the product is only about 95%, the consumption of raw materials is large, methylamine is not completely absorbed, and it is emitted in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C215/12C07C213/04
Inventor 顾泽元龚六兴陈政顾晓峰张炜王玉莲
Owner JIANGSU TAIHU CHEM
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