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Method for synthesizing naphthalene-based water reducer from residues of phthalic anhydride prepared by naphthalene method

A technology of naphthalene-based water reducer and phthalic anhydride, which is applied in the field of naphthalene-based water reducer synthesized from the residue of phthalic anhydride prepared by the naphthalene method, which can solve the problems of large fluctuations in market supply and high production costs, so as to reduce production costs and hinder cement hydration Effect

Pending Publication Date: 2021-11-23
TAIXING XIELIAN ZHONGDA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the vigorous development of the construction industry, higher requirements are put forward for the quality of construction, construction speed, construction environment and comprehensive cost. Or retarding, economical, convenient construction and other properties are used more and more. At present, there are three main types of superplasticizers on the market: naphthalene-based superplasticizers, melamine-based superplasticizers and woody turbulent superplasticizers. Among them, the naphthalene-based high-efficiency water-reducing agent is the most widely used, and its main raw material is industrial naphthalene. However, in recent years, the price of naphthalene and market supply have fluctuated greatly, making the production cost of manufacturing naphthalene-based high-efficiency water-reducing agents higher. There are certain restrictions in construction, which provides a new way to reduce production costs, and also for the rational use of industrial waste. Therefore, a method for synthesizing naphthalene-based water reducers from the residue of phthalic anhydride prepared by naphthalene method is proposed.

Method used

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  • Method for synthesizing naphthalene-based water reducer from residues of phthalic anhydride prepared by naphthalene method

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Effect test

Embodiment 1

[0019] Embodiment 1. The present invention provides a technical solution: a method for synthesizing naphthalene-based water reducer from the residue of phthalic anhydride prepared by naphthalene method, comprising the following steps;

[0020] Step 1: Take 35 parts of phthalic anhydride residues and grind them through crushing equipment, then put the crushed phthalic anhydride residues into the reaction kettle, stir the phthalic anhydride residues, slowly drop 5 parts of concentrated sulfuric acid into the stirring process, and control the temperature at 110 minutes at 220°C;

[0021] Step 2: Cool down to 135°C, add water for hydrolysis for 90 minutes, then cool down to 93°C again;

[0022] Step 3: Pour 10 parts of industrial naphthalene oil into the reaction bottle, heat up to 70°C and start stirring until the temperature rises to 90°C, pour it into the reaction kettle, add 2 parts of modifier to the reaction kettle and stir until uniform;

[0023] Step 4: Drop 3 parts of f...

Embodiment 2

[0025] Embodiment 2. The present invention provides a technical solution: a method for synthesizing naphthalene-based water reducer from the residue of phthalic anhydride prepared by naphthalene method, comprising the following steps;

[0026] Step 1: Take 38 parts of phthalic anhydride residues and grind them through crushing equipment, then put the crushed phthalic anhydride residues into the reaction kettle, stir the phthalic anhydride residues, slowly drop 5 parts of concentrated sulfuric acid into the stirring process, and control the temperature at 110 minutes at 240°C;

[0027] Step 2: Cool down to 140°C, add water for hydrolysis for 95 minutes, then cool down to 90°C again;

[0028] Step 3: Pour 12 parts of industrial naphthalene oil into the reaction bottle, heat up to 80°C and start stirring until the temperature rises to 100°C, then pour it into the reaction kettle, add 4 parts of modifier to the reaction kettle and stir until uniform;

[0029] Step 4: Drop 3 part...

Embodiment 3

[0031] Embodiment 3. The present invention provides a technical solution: a method for synthesizing naphthalene-based water reducer from the residue of phthalic anhydride prepared by naphthalene method, comprising the following steps;

[0032] Step 1: Take 30 parts of phthalic anhydride residue and grind it through the crushing equipment, then put the crushed phthalic anhydride residue into the reaction kettle, stir the phthalic anhydride residue, slowly drop 4 parts of sulfamic acid in the stirring process, and control the temperature Maintain at 230°C for 110 minutes;

[0033] Step 2: Cool down to 130°C, add water for hydrolysis for 100 minutes, then cool down to 95°C again;

[0034] Step 3: Pour 11 parts of industrial naphthalene oil into the reaction bottle, heat up to 70°C and start stirring until the temperature rises to 110°C, then pour it into the reaction kettle, add 4 parts of modifier to the reaction kettle and stir until uniform;

[0035] Step 4: Add 3 parts of f...

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Abstract

The invention discloses a method for synthesizing a naphthalene-based water reducer from residues of phthalic anhydride prepared by a naphthalene method. The preparation method comprises the following steps: step 1, taking 30-40 parts of phthalic anhydride residues, crushing by virtue of crushing equipment, then putting the crushed phthalic anhydride residues into a reaction kettle, stirring the phthalic anhydride residues, slowly dripping 3-5 parts of sulfonating agent in the stirring process, and controlling the temperature to be 220-250 DEG C and maintaining for 100-120 minutes; step 2, cooling to 120-140 DEG C, adding water to hydrolyze for 90-110 minutes, and cooling to 90-100 DEG C again. The phthalic anhydride residues contain more groups such as carbonyl, carboxyl, hydroxyl and the like, and the groups have the functions similar to those of hydroxyl in a citric acid retarder and play a certain role in blocking cement hydration in the cement hydration process, so that the effect is not lower than that of an original water reducing agent, and meanwhile, the production cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a method for synthesizing a naphthalene-based water reducer from the residue of phthalic anhydride prepared by a naphthalene method. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of the concrete basically unchanged. Most of them belong to anionic surfactants, including lignosulfonate and naphthalenesulfonate formaldehyde polymers. Etc. After adding concrete mixture, it can disperse cement particles, improve its workability, reduce unit water consumption, and improve the fluidity of concrete mixture; or reduce unit cement consumption and save cement; [0003] With the vigorous development of the construction industry, higher requirements are put forward for the quality of construction, construction speed, construction environment and comprehensive cost. Or retarding, economical, co...

Claims

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Application Information

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IPC IPC(8): C04B24/22C04B103/30
CPCC04B24/226C04B2103/302
Inventor 张国华周斌张智慧
Owner TAIXING XIELIAN ZHONGDA CHEM CO LTD
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