Continuous technology for producing polycarboxylate superplasticizer monomer polyether through one-step method

A monomer polyether and polycarboxylic acid technology, applied in the field of polyether synthesis, can solve the problems of long production cycle, affecting product quality, quality fluctuation, etc., to improve production efficiency and product yield, and reduce the difficulty of process and operation , Improve the effect of product quality stability

Inactive Publication Date: 2016-01-27
FUSHUN DONGKE FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem existing in the batch method of kettle production is that after the product is synthesized from the raw materials to the finished product, a certain amount of finished product remains in the reactor when it is produced again. If the reactor is cleaned, a large amount of waste water will be generated; if it is not cleaned, it will cause Quality fluctuations, affecting product quality
In addition, when synthesizing high-molecular-weight products, due to the influence of reactor diameter, volume, and reaction form, it is usually necessary to synthesize a lower-molecular-weight intermediate first, and it is impossible to synthesize the product in one step.
In addition, the long production cycle and low yield of the product increase the cost of the product and reduce the market competitiveness of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The continuous method synthesis of four reactors with a molecular weight of methacryl alcohol polyoxyethylene ether of 2400:

[0031] ①Put 360kg of methacrylic alcohol and 14kg of flake potassium hydroxide into the 3m3 reactor A, use high-purity N2 to replace the air in the reactor three times, then vacuum pump to below -0.095MPa, heat the reactor to 85°C, slowly Feed ethylene oxide into the reactor at a uniform speed to make up to 0.05MPa. After the material in the reactor initiates the reaction to release heat, the temperature of the reactor is slowly raised to 90° C., and then 1390 kg of ethylene oxide is introduced into the reactor. Control the reaction temperature T=95-105°C, and the reaction pressure P<0.10MPa. After feeding, keep the temperature T=95-105°C for 0.5h under reduced pressure, and then import all the materials into the 6m3 reactor B.

[0032] ②After the A kettle is poured, continue to repeat the production process of the A kettle. At the same time, ...

Embodiment 2

[0037] The continuous synthesis of prenol polyoxyethylene ether with a molecular weight of 2000 by four reactors:

[0038] ①Put 430kg of isopentenol and 21kg of flake sodium hydroxide into the 3m3 reactor A, replace the air in the reactor with high-purity N2 three times, then vacuum pump to below -0.095MPa, heat the reactor to 85°C, and slowly Feed ethylene oxide into the reactor at a uniform speed to make up to 0.05MPa. After the material in the reactor initiates the reaction to release heat, the temperature of the reactor is slowly raised to 90° C., and then 1100 kg of ethylene oxide is introduced into the reactor. Control the reaction temperature T=95-105°C, and the reaction pressure P<0.10MPa. After feeding, keep the temperature T=95-105°C for 0.5h under reduced pressure, and then import all the materials into the 6m3 reactor B.

[0039]②After the A kettle is poured, continue to repeat the production process of the A kettle. At the same time, material in the B kettle beg...

Embodiment 3

[0043] Embodiment 3: four reaction kettles continuous method synthetic molecular weight is the tetrahydroxybutyl vinyl polyoxyethylene ether of 4000:

[0044] ①Put 355kg of tetrahydroxybutyl vinyl ether and 35kg of sodium hydride into the 3m3 reactor A, use high-purity N2 to replace the air in the reactor three times, then vacuum pump to below -0.095MPa, heat the reactor to 85°C, and slowly Feed ethylene oxide into the reactor at a uniform speed to make up to 0.05MPa. After the material in the reactor initiates the reaction to release heat, the temperature of the reactor is slowly raised to 90° C., and then 1536 kg of ethylene oxide is introduced into the reactor. Control the reaction temperature T=95-105°C, and the reaction pressure P<0.10MPa. After feeding, keep the temperature T=95-105°C for 0.5h under reduced pressure, and then import all the materials into the 6m3 reactor B.

[0045] ②After the A kettle is poured, continue to repeat the production process of the A kettle...

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PUM

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Abstract

The invention discloses a continuous technology for producing polycarboxylate superplasticizer monomer polyether through a one-step method. The technology includes the steps that with unsaturated alcohol or unsaturated alcohol ether or unsaturated amine as an initiator, epoxide polymerization is performed in a segmented mode in multiple reaction kettles at certain temperature and pressure under the action of a catalyst, and continuous synthesis is performed to obtain the product. The technology has the advantages that for synthesis of the polycarboxylate superplasticizer monomer polyether, by performing epoxide polymerization in the segmented mode in the multiple reaction kettles, the problem that one-step method production of high-molecular-weight products is difficult is solved; the continuous production technology thoroughly changes single intermittent kettle type production of such products, and continuous production improves the product production efficiency and increases the product yield; as the mode of using the special kettles for special purposes is formed, namely, each kettle is used for producing a fixed molecular structure with a fixed molecular weight of the product in a certain step, product quality stability is substantially improved, and technology and operation difficulty is lowered.

Description

1. Technical field [0001] The invention belongs to the technical field of polyether synthesis, and relates to a continuous process for producing polycarboxylate water reducer monomer polyether in one step. 2. Background technology [0002] High-efficiency polycarboxylate superplasticizer is the third generation of high-performance superplasticizer. Compared with the previous two generations of superplasticizers, it has the characteristics of low dosage, high water-reducing rate, no segregation and high slump retention. It is the designated high-speed passenger railway in my country. admixture. Monomer polyether is the main raw material for synthesizing high-efficiency polycarboxylate superplasticizers, which usually use unsaturated alcohols or unsaturated alcohol ethers as initiators, such as propenyl alcohol and its homologues, prenyl alcohol, methyl It is synthesized from propylene alcohol glycol ether, tetrahydroxybutyl vinyl ether, etc., and the reaction method is batch ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G65/26
Inventor 徐仕睿刘勇
Owner FUSHUN DONGKE FINE CHEM
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