Process for de-inking waste newspaper by biologic enzyme

A bio-enzyme and newsprint technology, applied in the field of bio-enzyme deinking process, can solve the problems of high deinking cost and large fiber loss, and achieve the effects of reducing chemical usage, improving pulp yield, and reducing waste water pollution load.

Inactive Publication Date: 2010-06-02
FUJIAN JIAFENG BIOCHEM
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Problems solved by technology

[0008] This process also has the disadvantages of using a large amount of sodium hydroxide and hydrogen peroxide, high deinking cost, and large fiber loss

Method used

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  • Process for de-inking waste newspaper by biologic enzyme

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Embodiment Construction

[0015] The process steps and formula of the present invention are: including deinking agent preparation, high-concentration pulper pulping, flotation separation ink process, wherein the deinking agent formula contains cellulase, lipase, amylase, xylanase, Surfactant, it is characterized in that technological process is:

[0016] ① Preparation of deinking agent: Add one or more of alkaline lipase, amylase, and xylanase to cellulase to make a compound enzyme; the ratio of each component in the compound enzyme is: 2000-10000U cellulose Enzyme, 10000-100000U alkaline lipase, 1000-5000U xylanase and 8000-15000U amylase, and then add 0.05-0.15 kg of surfactant to the compound enzyme of the weight to form a deinking agent;

[0017] Preparation of deinking agent without adding sodium hydroxide and hydrogen peroxide;

[0018] ②Pulping with high-consistency pulper: Add water at 40-60°C to the high-consistency pulper, and put it into waste newspaper and magazine paper (preferably US was...

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Abstract

The invention provides a process for de-inking waste newspaper by a biologic enzyme, which relates to the process of the pulping of waste paper. The process is characterized by comprising the following technological procedures of: (1) preparing a de-inking agent: adding one or several of alkali lipase, amylase and xylanase into cellulase to prepare a composite enzyme and then adding 0.05-0.15 kilogram of surfactant into the composite enzyme with the weight to form the de-inking agent, wherein the composite enzyme comprises the following components in proportion: 2000-10000U of cellulase, 10000-100000U of alkali lipase, 1000-5000U of xylanase and 8000-15000U of amylase; (2) pulping by using a high-concentration pulper: adding 40-60 DEG C water into the high-concentration pulper, counting by 100 kilograms of absolutely dry paper, putting 10-150 grams of de-inking agent and 0.2-0.4 kilogram of sodium metassilicate nonahydrate into waste newspaper and journal paper and stopping after starting the pulper for 10-30 minutes; and (3) carrying out the procedures of floatation and printing ink separation to obtain the de-inked pulp. The invention has the advantages that sodium hydroxide and hydrogen peroxide are not used, and the production cost and the wastewater pollution are lowered.

Description

Technical field: [0001] The invention relates to waste paper pulping technology, especially biological enzyme deinking technology. Background technique: [0002] Compared with wood pulp and paper making, using waste paper to make paper can save a lot of forest resources, protect the ecology, reduce pollution, reduce investment, and reduce energy consumption. Therefore, waste paper has become an important source of raw materials for the paper industry today, and its proportion is increasing. Among them, waste newsprint, especially waste newsprint imported from Europe and the United States, is gradually favored by large domestic paper companies due to its large quantity and excellent and stable quality. . [0003] Deinking is an important link in waste paper pulping. At present, waste paper deinking mainly includes mechanical method, pure chemical method and biological enzyme method. The most common is the pure chemical method, which is also the industrial sodium soap metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 张向明谢必峰杨亚茹
Owner FUJIAN JIAFENG BIOCHEM
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