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Method for producing naphthalene series water reducing agent and aliphatic water reducing agent

The technology of aliphatic water-reducing agent and naphthalene-based water-reducing agent is applied in the field of preparation of concrete water-reducing agent for construction, and achieves the effect of reducing cost, being environmentally friendly, and solving the problem of post-treatment of solid waste.

Active Publication Date: 2012-12-19
ZHEJIANG DIBANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The publication number is CN1066448A patent document discloses a kind of manufacturing method of sulfonated acetone-formaldehyde condensate, mainly adopts the method of alkali catalysis in the sulfonation process, at present, never has used the waste water formed in the production process of naphthalene-based water reducer to directly Report as raw material for production of aliphatic water reducer

Method used

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  • Method for producing naphthalene series water reducing agent and aliphatic water reducing agent
  • Method for producing naphthalene series water reducing agent and aliphatic water reducing agent
  • Method for producing naphthalene series water reducing agent and aliphatic water reducing agent

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Effect test

Embodiment 1

[0024] Each material is by mass ratio: industrial naphthalene and washing oil mixed raw material: sulfuric acid: sulfur trioxide: hydrolyzed water: formaldehyde solution=1: 0.84: 0.21: 0.45: 0.59, (the mass ratio of industrial naphthalene and washing oil mixture=1: 1). In the sulfonation reaction pot, add 1kg of industrial naphthalene and 1kg of washing oil as mixed raw materials, heat and melt; when the temperature continues to rise to 120°C, add 1.68kg of sulfuric acid with a concentration of 98%, and pass through 420g of sulfur trioxide to carry out sulfonation reaction for 0.5h After the sulfur trioxide is fully reacted, the vacuum absorption device is opened, and the sulfur dioxide gas pulled out by vacuum is absorbed by aqueous sodium hydroxide solution to prepare a sodium sulfite solution with a pH value of 9-10 and a concentration of 25% by mass. Then the reaction materials in the sulfonation reactor are warmed up to 145° C. for 3 hours, and the total acidity of the so...

Embodiment 2

[0027]Each material is by mass ratio: industrial naphthalene and washing oil mixed raw material: sulfuric acid: sulfur trioxide: hydrolyzed water: formaldehyde solution=1: 0.32: 0.58: 0.4: 0.59, (the mass ratio of industrial naphthalene and washing oil mixture=9: 1). In the sulfonation reaction pot, add 0.9kg of industrial naphthalene and 0.1kg of washing oil as raw materials, heat and melt; when the temperature continues to rise to 120°C, add 0.32kg of sulfuric acid with a concentration of 98%, and pass in 0.58kg of sulfur trioxide for sulfonation After reacting for 1 hour, the sulfur trioxide is fully reacted and the vacuum absorption device is turned on, and the sulfur dioxide gas pulled out by vacuum is absorbed by aqueous sodium hydroxide solution to prepare a sodium sulfite solution with a pH value of 10-11 and a concentration of 94% by mass. Then heat up the reaction materials in the sulfonation reactor to 145°C and keep it warm for 3 hours, and react until the total ac...

Embodiment 3

[0030] Each material is by mass ratio: industrial naphthalene and washing oil mixed raw material: sulfuric acid: sulfur trioxide: hydrolyzed water: formaldehyde solution=1: 0.84: 0.21: 0.45: 0.59, (the mass ratio of industrial naphthalene and washing oil mixture=1: 9). In the sulfonation reaction pot, add 0.1kg of industrial naphthalene and 0.9kg of washing oil as mixed raw materials, heat and melt; when the temperature continues to rise to 120°C, add 0.84kg of sulfuric acid with a concentration of 98%, and pass in 210g of sulfur trioxide to carry out sulfonation reaction After 1h, the sulfur trioxide is fully reacted and the vacuum absorption device is opened, and the sulfur dioxide gas pulled out by vacuum is absorbed with a concentrated sodium hydroxide aqueous solution to prepare a mixed solution of sodium sulfite and sodium bisulfite with a pH value of 7 to 8 and a mass percentage concentration of 25%. . Then the reaction materials in the sulfonation reactor were warmed ...

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Abstract

The invention discloses a method for producing a naphthalene series water reducing agent and an aliphatic water reducing agent, which comprises the following steps of: melting industrial naphthalene and methyl naphthalene, adding concentrated sulfuric acid and sulfur trioxide to perform sulfonation reaction, performing hydrolysis by adding water after the reaction is finished, then adding aqueoussolution of formaldehyde to perform condensation reaction, and finally, adding sodium hydroxide to neutralize the reaction solution till the pH value is 7 to 9 so as to obtain the naphthalene series water reducing agent; and in the sulfonation reaction, reclaiming sulfur dioxide in the reaction system by using the aqueous solution of sodium hydroxide to obtain sodium sulfite reclaimed solution ormixed reclaimed solution of sodium sulfite and sodium hydrogen sulfite, adding acetone and formaldehyde into the reclaimed solution in turn, and obtaining the aliphatic water reducing agent after thereaction is finished. The high-cost industrial naphthalene is replaced by using low-cost methyl naphthalene or wash oil in the method, and the quality of the prepared naphthalene series water reducing agent reaches Chinese quality standard GB8076-2008; and the method solves the problem of sulfur dioxide waste gas utilization, reduces the cost for producing the aliphatic water reducing agent, changes waste into valuable, and has the characteristics of energy conservation and environmental friendliness.

Description

technical field [0001] The invention relates to the field of preparation of concrete water-reducers for construction, in particular to a method for co-producing naphthalene-based water-reducers and aliphatic water-reducers. Background technique [0002] Concrete admixtures have become the five major components of modern concrete materials, and water reducers are the most important and commonly used concrete admixtures. High-efficiency water reducer, also known as superplasticizer, is mainly composed of anionic surfactants. It mainly improves the properties of the solid-liquid interface to significantly reduce the water consumption of fresh concrete while maintaining the workability of the concrete mixture. [0003] Since the early 1970s in the 20th century, my country began to study the synthesis, manufacture and application performance of naphthalene-based high-efficiency water reducers, and successfully developed UNF-5 and FDN series high-efficiency water reducers (CN87104...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B24/16C04B103/30
Inventor 徐万福傅伟松陈华祥阮景芳
Owner ZHEJIANG DIBANG CHEM