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Method for preparing furyl alcohol through hydrolysis reaction in maltol Grignard section

A hydrolysis reaction and furfuryl alcohol technology, applied in the direction of organic chemistry, can solve the problems of manpower and material resources, increase of raw material cost, long production process, etc., and achieve the goals of reducing waste treatment, providing product yield, and increasing single-pot output Effect

Inactive Publication Date: 2021-03-12
ANHUI JINGHE IND
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The production process of maltol is divided into grignard section, chlorination section, sublimation section, crystallization section and drying section; the whole production process is long and there are many kinds of raw materials, and the production of grignard section is also divided into several steps, namely: Grignard reaction, addition reaction, hydrolysis reaction, Grignard reaction is magnesium and methyl chloride under the protection of benzene, tetrahydrofuran and other solvents to generate Grignard reagent, addition reaction is Grignard reagent and furfural reaction to obtain addition reagent, hydrolysis reaction is to use The magnesium chloride aqueous solution reacts with the addition reagent to obtain the furfuryl alcohol solution, and the magnesium chloride aqueous solution is configured in a certain proportion, which requires manpower and material resources and wastes time, increasing the cost of raw materials

Method used

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Embodiment Construction

[0015] A method for preparing furfuryl alcohol by hydrolysis reaction of maltol Grignard section, comprising the following steps:

[0016] (1) Inject water into the Grignard hydrolysis header tank;

[0017] (2) Add water dropwise to the addition reagent for hydrolysis reaction, the drop rate is 150L / h, the reaction time is 3h, and the reaction temperature is controlled at 0-30°C during the reaction process;

[0018] (3) hydrolysis reaction to obtain furfuryl alcohol solution;

[0019] (4) Combine all the tail gas of the whole maltol Grignard section for recovery through the absorption tower. Water is used as the solvent in the absorption tower, and the tower washing water of the absorption tower is returned to the step (1) as hydrolysis water and injected into the Grignard hydrolysis head tank, and circulated use.

[0020] Advantages of this method:

[0021] 1. Magnesium chloride aqueous solution needs to be prepared in a certain proportion. Water does not need to be prepar...

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Abstract

The invention discloses a method for preparing furyl alcohol through hydrolysis reaction in a maltol Grignard section. The method comprises the following steps: (1) injecting water into a Grignard hydrolysis elevated tank; (2) dropwise adding water into an addition reagent to carry out hydrolysis reaction at the dropwise adding speed of 150L / h for 3 hours, and controlling the reaction temperatureto be 0-30 DEG C in the reaction process; (3) carrying out hydrolysis reaction to obtain a furfuryl alcohol solution; and (4) converging all the tail gas of the whole maltol Grignard section, recovering through an absorption tower, taking water as a solvent in the absorption tower, returning tower washing water of the absorption tower to the step (1) as hydrolysis water, injecting the hydrolysis water into the Grignard hydrolysis elevated tank, and recycling. The method saves the production cost, reduces the environmental pollution and improves the conversion rate of the Grignard hydrolysis section.

Description

technical field [0001] The invention relates to a method for preparing furfuryl alcohol by hydrolyzing maltol in a Grignard stage. Background technique [0002] The production process of maltol is divided into grignard section, chlorination section, sublimation section, crystallization section and drying section; the whole production process is long and there are many kinds of raw materials, and the production of grignard section is also divided into several steps, namely: Grignard reaction, addition reaction, hydrolysis reaction, Grignard reaction is magnesium and methyl chloride under the protection of benzene, tetrahydrofuran and other solvents to generate Grignard reagent, addition reaction is Grignard reagent and furfural reaction to obtain addition reagent, hydrolysis reaction is to use The magnesium chloride aqueous solution reacts with the addition reagent to obtain the furfuryl alcohol solution, and the magnesium chloride aqueous solution is configured in a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/44
CPCC07D307/44
Inventor 秦基楼孟令东李仁昌
Owner ANHUI JINGHE IND