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Method for recovering free starch in papermaking white water

A technology for papermaking white water and starch, applied in the field of pulping and papermaking, can solve the problems of low molecular weight of starch, influence of biological treatment of wastewater, influence of operation efficiency, etc.

Active Publication Date: 2021-03-19
RISINGSTAR BIOTECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there are some deficiencies in the above-mentioned technologies: in order to prevent the shortening of the starch chain, it is necessary to fully and effectively control the microorganisms and prevent them from secreting amylase. These methods need to add a large amount of Bactericides will affect the subsequent biological treatment of wastewater
In addition, because the starch in papermaking white water mainly comes from surface sizing, its starch molecular weight is low, it is uncharged, and it is difficult to retain it in the paper, resulting in a large amount of starch remaining in the pulping and papermaking system. These starches not only serve as Microbial nutrients will increase microbial growth, and starch accumulation will eventually cause "starch sticky" deposition problems, resulting in paper defects and end breaks, affecting operational efficiency
[0008] So far, there is no real effective solution to the recycling of starch dissolved in papermaking white water

Method used

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  • Method for recovering free starch in papermaking white water
  • Method for recovering free starch in papermaking white water
  • Method for recovering free starch in papermaking white water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0330] The structure of embodiment 1 starch binding agent is on the influence of binding agent and starch reaction

[0331] In this example, the reaction of starch binders with different structures and native starch (only cured, not modified) was tested.

[0332] Experimental steps: (1) take a cornstarch sample and prepare 7% "standard starch solution"; (2) take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 1600mg / L, and the pH of the obtained solution is between 6.7- Between 7.1; (3) Take 500mL of the prepared starch solution, put it in a beaker, and put it into a preset constant temperature water bath at 45°C; (4) Depending on the concentration of the prepared starch complexing agent, Add 3-30mg / L starch complexing agent so that the starch:complexing agent weight ratio is 50:1, then react for 30 minutes to obtain a modified starch solution; (5) sample and centrifuge (4000x g) for 5 minutes, take the sup...

Embodiment 2

[0336] Embodiment 2 Reaction pH is to the reaction of starch binding agent and starch and the influence to the adsorption effect of modified starch

[0337] In this example, the effect of solution pH on the reaction between starch binder and starch and the performance of modified starch (reaction product, modified starch) was investigated.

[0338] Experimental steps: (1) take a cornstarch sample and prepare a 7% "standard starch solution"; (2) take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 600mg / L, and the pH of the obtained local solution is 6.7 Between -7.1; (3) Take 500mL of the prepared starch solution, put it in a beaker, and put it into a preset constant temperature water bath at 45°C, and adjust the pH of the starch solution by adding hydrochloric acid or sodium hydroxide; (4 ) add zwitterionic starch complexing agent until its solution concentration reaches 30mg / L (that is, the mass ratio of ...

Embodiment 3

[0342] Embodiment 3 Reaction temperature is to the influence of starch binding reaction and the adsorption effect of modified starch

[0343] Experimental steps: (1) Take corn starch samples to prepare 7% "standard starch solution"; (2) Take an appropriate amount of standard starch solution and add deionized water to dilute to a starch concentration of about 600mg / L; (3) Take the prepared starch solution 500mL, placed in a beaker, and placed in a constant temperature water bath with the required test temperature set in advance, and equilibrated to the specified temperature; (4) According to the test requirements, add starch binder until the solution concentration reaches 30mg / L (i.e. starch The mass ratio with the starch complexing agent is 20:1), reacted for 60 minutes to obtain a modified starch solution (reaction pH between 6.5-7.0); (5) sample centrifugation (4000x g) for 5 minutes, and take the supernatant Test the starch content; (6) Add chemical pulp (BKP) to the remain...

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Abstract

The invention relates to a method for recovering free starch in papermaking white water. The method comprises the following steps: (a) reacting a zwitterionic starch complexing agent with the free starch in the papermaking white water to modify the free starch; the chemical structure of the zwitterionic starch complexing agent comprises i) one or more hydrophobic groups, wherein at least one of which is capable of reacting with starch to generate an inclusion complex, and ii) one or more hydrophilic groups, wherein at least one of which is an anionic hydrophilic group, at least one hydrophilicgroup is a cationic hydrophilic group, the hydrophilic groups are connected through chemical bonds to form one tail end of a molecular structure, and the hydrophobic groups and the hydrophilic groupsare located at the two ends of the same molecular structure respectively and connected through chemical bonds to form an asymmetric and polar structure. The method can effectively reduce the contentof free starch in papermaking white water, thereby reducing the COD discharge amount of papermaking wastewater.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a method for recovering free starch in papermaking white water. Background technique [0002] The entire production process of the pulp and paper industry, including from material preparation to paper making, chemical recycling, and paper processing, requires a large amount of water for conveying, washing, dispersing materials, and cooling equipment. Although there are recycling, treatment, and reuse in the production process, a large amount of waste water is still discharged into the water body, causing serious pollution to the water environment. Worldwide, paper industry wastewater is an important source of pollution. For example, Japan and the United States list paper industry wastewater as one of the six major public hazards and one of the five major public hazards. [0003] At present, my country's paper industry wastewater discharge and COD discharge rank f...

Claims

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Application Information

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IPC IPC(8): C02F1/54C08B31/00C02F103/28
CPCC02F1/54C08B31/00C02F2103/28Y02W30/64
Inventor 王祥槐李志军胡维维刘波张福山
Owner RISINGSTAR BIOTECH GUANGZHOU
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