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Gas-solid method production technology of cellulose mixed ether

A production process and technology of mixed ethers, applied in the field of gas-solid production process of cellulose mixed ethers, can solve the problems of low production efficiency, low yield, long reaction time, etc., to improve utilization rate, reduce production cost, utilize rate-enhancing effect

Inactive Publication Date: 2020-02-18
山东赫达集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the deficiencies in the prior art, the object of the present invention is to provide a gas-solid production process of cellulose mixed ether, which is simple and efficient, and solves the problems of long reaction time, low yield and low production efficiency of conventional processes. Moreover, the uniformity of etherification substitution is better, the product properties are uniform and stable, the occurrence of side reactions is reduced, the utilization rate of etherification agent is improved, and the production cost is saved

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  • Gas-solid method production technology of cellulose mixed ether

Examples

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Embodiment 1

[0047] Adopt the gas-solid method production technique of the present invention to prepare hydroxyethyl methyl cellulose ether, the steps are as follows:

[0048] (1) Grinding: Grinding the cellulose pulp to a particle size of 200±20 μm and a bulk density of 180±20 g / L to obtain powdery cellulose;

[0049] (2) Alkalinization and etherification: 2650kg powdery cellulose is added in the horizontal reaction kettle, then add 4000kg concentration of 50wt% sodium hydroxide solution, 400kg ethylene oxide, 1860kg methyl chloride and 1600kg dimethyl ether, control horizontal The pressure of the reaction kettle is 2.3MPa, the temperature is raised to 70°C at a uniform speed, the heating time is 1.5h, and the temperature is kept for 1.5h to carry out the alkalization etherification reaction;

[0050] (3) Neutralization: after the reaction finishes, unreacted etherifying agent and dimethyl ether are recovered, then hydrochloric acid is added for neutralization, so that the pH value of the...

Embodiment 2

[0066] Adopt the gas-solid method production technique of the present invention to prepare hydroxypropyl methylcellulose ether, the steps are as follows:

[0067] (1) Grinding: Grinding the cellulose pulp to a particle size of 200±20 μm and a bulk density of 180±20 g / L to obtain powdery cellulose;

[0068] (2) Alkalinization and etherification: 2650kg powdery cellulose is added in the horizontal reaction kettle, then add 4200kg concentration of 50wt% sodium hydroxide solution, 650kg propylene oxide, 2600kg methyl chloride and 1600kg dimethyl ether, control the horizontal reactor The pressure of the reaction kettle is 2.3MPa, the temperature is raised to 70°C at a uniform speed, the heating time is 1.5h, and the temperature is kept for 1.5h to carry out the alkalization etherification reaction;

[0069] (3) Neutralization: after the reaction finishes, unreacted etherifying agent and dimethyl ether are recovered, then hydrochloric acid is added for neutralization, so that the pH...

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Abstract

The invention relates to the technical field of cellulose mixed ethers, and concretely relates to a gas-solid method production technology of cellulose mixed ether. The gas-solid method production technology of the cellulose mixed ether comprises the following steps: crushing cellulose pulp to obtain powdery cellulose; adding the powdery cellulose into a reactor, adding an alkali liquor, an etherifying agent and dimethyl ether, and raising the temperature at a constant speed for a reaction; recovering the unreacted etherifying agent and dimethyl ether after the reaction is finished, and then adding hydrochloric acid to neutralize; and adding water into the neutralized material to wash, and carrying filtering, leaching and steam filter pressing, and crushing and drying the obtained materialto obtain the finished product cellulose mixed ether. The gas-solid method production technology of the cellulose mixed ether is simple and efficient, solves the problems of long reaction time, low yield and low production efficiency of conventional technologies, and has he advantages of good etherification substitution uniformity, uniform and stable product properties, reduction of side reactions, increase of the utilization rate of the etherifying agent, and saving of the production cost.

Description

technical field [0001] The invention relates to the technical field of cellulose mixed ethers, in particular to a gas-solid production process of cellulose mixed ethers. Background technique [0002] Cellulose ether is an important class of water-soluble polymer compounds, a general term for a series of products produced from natural cellulose through alkalization and etherification. Cellulose ether is a polymer compound with an ether structure made from cellulose. Each glucosyl ring in the cellulose macromolecule contains three hydroxyl groups, the primary hydroxyl group on the sixth carbon atom, the secondary hydroxyl group on the second and third carbon atoms, and the hydrogen in the hydroxyl group is replaced by a hydrocarbon group to generate cellulose ether derivatives thing. It is a product in which the hydrogen of the hydroxyl group in the cellulose polymer is replaced by a hydrocarbon group. Cellulose is a polyhydroxy polymer compound that neither dissolves nor m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/193
CPCC08B11/193
Inventor 谭在英邱建军刘厚余王涛马超
Owner 山东赫达集团股份有限公司
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