Modified naphthalene water reducer containing waste residue generated in phenol production process

Abstract

The invention provides a modified naphthalene water reducer containing waste residue generated in a phenol production process, and relates to the technical field of building materials. The water reducer comprises the following components in parts by weight: 200 to 350 parts of industrial naphthalene, 220 to 400 parts of industrial concentrated sulfuric acid, 50 to 100 parts of the waste residue generated in the phenol production process, 150 to 200 parts of formaldehyde, 400 to 600 parts of liquid caustic soda, and 5 to 50 parts of water. A preparation method comprises the following steps: (1), weighing the raw materials; (2), feeding the industrial naphthalene into a four-mouth flash, heating the industrial naphthalene to 150 DEG C to be molten, rising the temperature, dropwise adding theconcentrated sulfuric acid while stirring and controlling the dropwise adding speed, performing thermal insulation reaction for 3 to 5h after dropwise adding is accomplished, and detecting the acid degree value of a material; (3), lowering the temperature to 120 DEG C, replenishing water according to the acid degree value, performing hydrolysis for 30min, adding the waste residue generated in thephenol production process after hydrolysis is accomplished, stirring for 30min, dropwise adding the formaldehyde at 100 to 115 DEG C while controlling the dropwise adding speed, performing thermal insulation reaction after dropwise adding is accomplished, and slowing adding the liquid caustic soda to regulate PH after thermal insulation is accomplished. The water reducer not only solves the problem of environment protection, but also creates an economic benefit.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a modified naphthalene-based water reducer containing waste residues in the production process of phenols. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. [0003] The waste residue produced during the synthesis of phenol or phenolic compounds or a small amount of residual mother liquor contains cumene, phenol, acetone, phenolic compounds and other substances, which are hazardous wastes and cannot be ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a modified naphthalene-based water reducer containing waste residues in the production process of phenols, which not only solves the problem of environmental protection, but also creates economic benefits

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