Gasification of sulphite thick liquor

A sulfite thick liquid and sulfite technology, which is applied in the regeneration of sulfite waste liquid, the regeneration of pulping liquid, pulping with acid salt/acid anhydride, etc., can solve the problem of poor performance and accumulation of melting layer , accumulation, etc.

Inactive Publication Date: 2013-01-16
坎雷克股份公司
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Problems solved by technology

The process did not meet the low smelt sulphide requirements set by other recovery processes at the time
Moreover, there were problems with the accumulation of smelt layers on the reactor walls, and the accumulation on the reactor lining of the ceramic materials available at that time was very serious
Likewise, the "SCA-Billerud craft" was subsequently abandoned due to poor performance

Method used

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  • Gasification of sulphite thick liquor
  • Gasification of sulphite thick liquor
  • Gasification of sulphite thick liquor

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Embodiment Construction

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0033] The following detailed description, and the examples contained herein are for the purpose of illustration and merely illustrate certain embodiments of the invention and are not intended to limit the scope of the invention in any way.

[0034] figure 1 A flow diagram of a typical chemical recovery cycle for sodium sulfite pulping is shown. The chemical recovery cycle described will only be briefly explained here, since it is common knowledge to those skilled in the art. Chips A are pumped into a digester where delignification / pulping process B is carried out in a suitable sulfite cooking liquor at elevated temperature to release cellulose fibers, pulp C. Pulp is separated from spent cooking liquor, also known as dilute sulfite thick liquor D, where spent cooking liquor is a mixture of spent cooking compounds and wood residues such as lignin. Raw pulp C is then ready but can usually be further processed in a bleac...

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Abstract

Method for recovering chemicals and energy from sulphite thick liquor, said sulphite thick liquor being obtained when producing pulp by chemical delignification of fibrous raw material using a sulphite pulping process, said sulphite thick liquor comprising organic and inorganic compounds; the method comprising processing of said organic and inorganic compounds at a temperature above 800 DEG C whereby producing partly at least one phase of a liquid material and partly at least one phase of a gaseous material, wherein said processing is carried out by gasification of said sulphite thick liquor in a gasification reactor (2) at sub-stoichiometric conditions and in the presence of an oxidizing medium; said reactor (2) having an opening in its bottom in the form of a chute (5), which opens directly into a quench compartment (38).

Description

technical field [0001] The present invention relates to a process for the recovery of chemicals and energy from sulphite thick liquors obtained during chemical delignification of fiber raw materials using sulphite pulping processes obtained during the preparation of pulp, said sulphite thick liquor comprising organic and inorganic compounds; the process comprises treating said organic and inorganic compounds at a temperature higher than 800°C, thereby partially producing at least one The liquid material phase and the portion yield at least one gaseous material phase. Background technique [0002] The sulfite pulping process is the chemical pulping process of wood chips in the preparation of pulp. Sulphite pulping currently accounts for less than 10% of the world's pulp production, although it was historically a dominant pulping method until the major development of the Kraft (also known as kraft) pulping process made the process more popular. There are different sulphite p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/12D21C11/06D21C11/02
CPCD21C11/125D21C3/06D21C11/0064Y02P70/10D21C11/02D21C11/127
Inventor I.兰达尔夫E.弗鲁斯乔R.斯塔雷
Owner 坎雷克股份公司
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