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Process of the pulping of bleaching of vegetable material
| Details |
Inventors: Matsuura, Hiroshi;
Assignee: Japan Pulp & Paper Research Instutute Inc. (Tokyo, JA)
Primary Examiner: Bashore; S. Leon
Assistant Examiner: Smith; William F.
Attorney, Agent or Firm: Holman & Stern
A pulping process which includes the steps of oxidizing vegetable materials with an oxidizing chemical selected from the group comprising Cl.sub.2, Cl.sub.2 O,ClO.sub. 2, Mg(ClO).sub.2, Mg(ClO.sub.2).sub.2 Mg.(ClO.sub. 3).sub.2 and mixtures thereof, extracting the oxidized materials with Mg(OH).sub.2 thereby to delignify and bleach the materials and treating the waste liquor from the oxidation, extraction and washing steps by combustion or thermal decomposition thereby to regenerate the chemicals necessary for the oxidation and extraction steps. The process of the invention produces semi-bleached or completely bleached pulp of high strength with high yield while eliminating the problem relating to environmental pollution. |
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DETAILED DESCRIPTION A principal object of the present invention is to provide a process for producing pulp which incorporates improved pulping and bleaching steps therein.
According to the present invention, chips of vegetable materials are first pretreated by chemical, mechanical and/or thermal means and then subjected to plural treatment stages including at least one basic treatment stage which comprises combination of one oxidation treatment step with a member selected from the group which includes Cl.
sub.
2, Cl.
sub.
2 O, ClO.
sub.
2, Mg(ClO).
sub.
2, Mg(ClO.
sub.
2).
sub.
2, Mg(ClO.
sub.
3).
sub.
2 and mixtures thereof and one extraction treatment step with Mg(OH).
sub.
2.
The basic treatment stages can selectively delignify vegetable material and almost all of the cellulose and hemicellulose of the chips can be extracted from the materials without being subjected to mechanical and/or chemical damage.
Consequently, the pulp yield is high and the obtained pulp has high strength.
The high pulp yield and the high strength of pulp are due to the selective use of a member selected from the group comprising Cl.
sub.
2, Cl.
sub.
2 O, ClO.
sub.
2, Mg(ClO).
sub.
2, Mg(ClO.
sub.
2).
sub.
2, Mg(ClO.
sub.
3).
sub.
2 and mixtures thereof as the oxidizing agent as well as the use of Mg(OH).
sub.
2 as the extracting agent.
The use of the above-specified oxidizing agents and extraction agent assures a quite practical waste liquor treatment.
In other words, the waste liquor from the combined oxidation and extraction step is collected and burned or thermally decomposed.
As a result of the combustion or thermal decomposition of the waste liquor, MgO and Cl are separated from the liquor and collected in the form of MgO and HCl gas, respectively and the collected MgO and HCl gas are converted into the oxidation and extraction agents for reuse.
In this way, the present invention can provide a pulping process with a very effective chemical recovery system, and it can produce a pulp of high quality at a very high yield without any environmental pollution problems
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Molecular Biology 
