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A method for resource utilization of papermaking waste liquid and adhesive produced by the method

A papermaking waste liquid recycling technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of little application value and low reactivity, and achieve convenient operation and reduce Effects of environmental pollution and emission reduction

Inactive Publication Date: 2016-05-18
HUANGHUAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when lignin is used as a raw material to prepare lignin-phenolic resin and lignin-urea-formaldehyde resin, its reactivity is low and its application value is not great. It must be chemically modified to improve its reactivity.

Method used

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  • A method for resource utilization of papermaking waste liquid and adhesive produced by the method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method for resource utilization of papermaking waste liquid in this embodiment comprises the following steps:

[0034] 1) Concentrating the papermaking waste liquid to be treated to a solid content of 38% to obtain a concentrated waste liquid; the mass content of methoxy in the concentrated waste liquid is 24%;

[0035] 2) Add sodium sulfide to the concentrated waste liquid obtained in step 1), the mass ratio of sodium sulfide to concentrated waste liquid is 11.5:100, heat up to 250°C for demethoxyl treatment, so that the methoxyl of lignin in the waste liquid Decompose to generate dimethyl sulfide, evaporate and remove the generated dimethyl sulfide to obtain demethoxylation waste liquid;

[0036] 3) Put phenol in a flask, heat it to melt, add the demethoxylation waste liquid obtained in step 2) and mix to obtain a mixed liquid A; in the mixed liquid A, the mass fraction of the demethoxylated waste liquid 30%;

[0037] 4) Take 100 parts by weight of the mixed liq...

Embodiment 2

[0040] The method for resource utilization of papermaking waste liquid in this embodiment comprises the following steps:

[0041] 1) Concentrating the papermaking waste liquid to be treated to a solid content of 30% to obtain a concentrated waste liquid; the mass content of methoxy in the concentrated waste liquid is 18%;

[0042] 2) Add lithium sulfide to the concentrated waste liquid obtained in step 1), the mass ratio of lithium sulfide to concentrated waste liquid is 4:100, heat up to 250°C for demethoxyl treatment, so that the methoxyl of lignin in the waste liquid Decompose to generate dimethyl sulfide, evaporate and remove the generated dimethyl sulfide to obtain demethoxylation waste liquid;

[0043] 3) Put phenol in a flask, heat it to melt, add the demethoxylation waste liquid obtained in step 2) and mix to obtain a mixed liquid A; in the mixed liquid A, the mass fraction of the demethoxylated waste liquid 40%;

[0044]4) Take 100 parts by weight of the mixed liqui...

Embodiment 3

[0047] The method for resource utilization of papermaking waste liquid in this embodiment comprises the following steps:

[0048] 1) Concentrating the papermaking waste liquid to be treated to a solid content of 35% to obtain a concentrated waste liquid; the mass content of methoxy in the concentrated waste liquid is 22%;

[0049] 2) Add ammonium sulfide to the concentrated waste liquid obtained in step 1), the mass ratio of ammonium sulfide to concentrated waste liquid is 8.4:100, and heat up to 260°C for demethoxyl treatment, so that the methoxyl of lignin in the waste liquid Decompose to generate dimethyl sulfide, evaporate and remove the generated dimethyl sulfide to obtain demethoxylation waste liquid;

[0050] 3) Put phenol in a flask, heat it to melt, add the demethoxylation waste liquid obtained in step 2) and mix to obtain a mixed liquid A; in the mixed liquid A, the mass fraction of the demethoxylated waste liquid 50%;

[0051] 4) Take 100 parts by weight of the mi...

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Abstract

The invention discloses a method for resource utilization of a papermaking waste liquid, and an adhesive produced by the same. The method comprises the following steps of (1) concentrating the papermaking waste liquid to obtain a concentrated waste liquid; (2) adding a vulcanizing agent in the concentrated waste liquid to carry out demethoxylation treatment to obtain a demethoxylated waste liquid; (3) mixing phenol and the demethoxylated waste liquid to obtain a mixed liquid A; (4) adding sodium hydroxide and formaldehyde in the mixed liquid A in sequence and controlling a temperature of the system to carry out a condensation reaction to obtain a mixed liquid B; and (5) adding urea in the mixed liquid B, keeping the temperature, dehydrating and cooling to obtain the adhesive. The method for resource utilization of the papermaking waste liquid replaces phenol by the papermaking waste liquid, changes the waste into treasure, reduces discharge amount of the papermaking waste liquid, reduces environmental pollution, and has good economic benefits and environment benefits. The papermaking waste liquid is used as the raw material for producing the adhesive directly, in no need of extracting lignin from the waste liquid, so that the process is simple; operations are convenient and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of papermaking waste liquid treatment, and in particular relates to a method for resource utilization of papermaking waste liquid, and also relates to an adhesive produced by the method. Background technique [0002] Paper mills use caustic soda method or sulfate method to cook the waste liquid discharged from plant fiber raw materials to make pulp, which is called papermaking waste liquid. Papermaking waste liquid contains a large amount of lignin and some organic acid salts and residual NaOH, Na 2 S, etc., have a large amount of discharge and are difficult to treat; when treated as anhydrous, the initial investment is large and the operating cost is high, which has become a difficult problem in environmental pollution and governance. [0003] At present, there are mainly two approaches to the treatment and recovery of pulping and papermaking waste liquor at home and abroad. One is alkali recovery: the mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/14C08G8/28C08H7/00
Inventor 张果喻淼张昕柳准赵艳玲李晓宁赵剑飞
Owner HUANGHUAI UNIV