TH20535B - Continuous boiling with cold saturation and DOM control. - Google Patents

Abstract

DC60 (23/09/47) The wood chip treatment method allows chemical pulp (eg brown pulp) to be produced with enhanced fiber strength properties in zone or first. The wood chips are cooled (eg approx. 60-120 ° C) with first alkali liquid (25-35 g / l, which can be expressed as NaOH), then in the upper part of the apparatus. In continuous sub-zone or second stage, wood chips are then treated with first alkali liquid. Which has an alkali concentration which is at least 5 g / l less than that of the first liquid (eg 10-20 g / l) and Between approximately 120-160 ° C (ie 130-150 ° C). As such, extraction takes place to influence the changes in the treatment zone after the second zone has passed. The wood chips are then boiled at temperatures around 140-180 ° C (eg 150-170 ° C) and higher in the second zone. The wood chip treatment method allows chemical pulp (such as brown pulp) to be produced with enhanced zone or first fiber strength properties. The wood chips are cooled (eg approx. 60-120 ° C) with first alkali liquid (25-35 g / l, which can be expressed as NaOH), then in the upper part of the apparatus. In continuous sub-zone or second stage, wood chips are then treated with first alkali liquid. Which has an alkali concentration which is at least 5 g / l less than that of the first liquid (eg 10-20 g / l) and Between approximately 120-160 ° C (ie 130-150 ° C). As such, extraction takes place to influence the changes in the treatment zone after the second zone has passed. The wood chips are then boiled at temperatures around 140-180 ° C (eg 150-170 ° C) and higher in the second zone.

Claims (8)

1. Method of boiling refined cellulose fiber materials Which consists of A continuous and sequential step follows (a) in the first step. Will treat the material mud of the cellulose fiber material that has been Purify with first alkali liquid At temperatures between approximately 60-120 ° C and at first alkali concentrations greater than 10 g / l, which is shown as NaOH (b), the second stage treated cellulose fibrous material. Detailed at It is a material mud with a second alkali liquid. At a second alkali concentration equal to at least 5 g / l, expressed as NaOH, less than the first concentration. And at temperatures between approximately 120-160 ° C and (c) the cloning of the cellulose-fiber material was refined from the (b) process at temperatures between approximately 140-180 ° C for pulp production. Chemical 2. Method As stated in claim 1, step (a) is performed at temperatures between 95-105 ° C, step (b) at temperatures between 130-150 ° C, and step (b). (c) where the temperature is between approximately 150-170 ° C and the step temperature (c) is at least 5 ° C higher than the step temperature (b) 3. The method as specified in claim 1, where the procedure (b) will be performed using a white liquid and Procedure (a) will be performed using a white, green or black liquid 4. The method as specified in claim 1, in which Procedure (c) will Being treated at the concentration of An alkali of approximately 18-40 g / l throughout 5. Method as stated in claim 1 consisting of Step-by-step additional steps The emptying of the material after step (c) and in which step (b) is performed in a countercurrent manner 6. Method as specified in claim 1, where step (a) is performed to intensify The first concentrate is between approximately 25-35 g / l as NaOH and a step (b) is performed so that the second concentration is between approximately 10-20 g / l, which can be expressed as NaOH and The second concentration is approximately 7-15 g / l, which is expressed as NaOH which is less than the first concentration. 7. Method as stated in claim 6, consisting of Another additional step (d) that is between the (a) and (b) stages, is the extraction of alkali-containing liquids. One is partially removed from the material. 8. The method as outlined in claim 7, in which procedures (d), (b) and (c) will be performed in Upright continuous shredding 9. The method as specified in claim 8, in which procedure (a) will be performed in the sub-connected machine. Since it is upright, but only partially, 1 0. The method is specified in claim 8, where the procedure (b) is to be followed by the introduction of Liquid comes out of the digester, heating the brought out liquid And circulating of The liquid brought back to the digester again, filled with the filtered liquid. Or water into the liquid that was taken out before heating and recirculating in Sufficient amount to compensate approximately the liquid extracted in step (d) and add sufficient amount of white liquid to the recirculating liquid to assure the Al concentration. Kali of that part As required 1 1.Method of treatment of fine-grained cellulose-based material mud By using a continuous, upright transmission of feed to the digester Where the sub-machine will have a set Assembly of the first grate And two are placed in the digester near the top of the digester, with the second sieve assembly at the bottom. And was spaced from the set Assembly of the first grate Which the above methods will consist of Continuous steps and The following order is followed: (a) The delivery of fine-grained cellulose-fiber material in the sample feeder system. The first alkali concentration of at least 10 g / l was obtained in the form of NaOH and at the Is between about 60-120 ° C and the feeding of the saturated material. The model was cooled to the upper part of the digester (b). Partial alkali liquid extraction from the material by means of an assembly of 1st sieve (c) second fluid treatment Where there is a second alkali concentration of at least 5 g / l less than the first concentration between the first and second sieve assemblies and at temperatures equal to 120-160 ° C; and (d) boiling the material. Under the assembly of the second grill At temperatures between about 140-180 degrees Celsius 1 2. The method as outlined in claim 11, in which procedure (b) will be followed for the extraction of Liquid at approximately 80-120 degrees Celsius and with the alkali concentration at Equals about 3-5 g / l 1 3. Method as stated in claim 11, where step (a) is performed at temperatures between 80-110 ° C, step (c) at temperatures between 130-150 ° C and step (s). Step (d) at temperatures between 150-170 ° C and step temperature (d) at least 5 ° C higher than step temperature (c) 1. 4. The procedure described in claim 11 consists of one additional step (e), the procedure for removing some of the liquid from the mud. Using the assembly kit Of the third sieve Above the first grill assembly And the process of adopting The liquid returned in step (e) is re-circulated to the feeder 1 5. Procedures, as outlined in Claim 14, in which procedure (a) will be followed to intensify The first alkali concentration is between approximately 20-35 g / l, which is expressed as NaOH and a procedure (c) is performed so that the second alkali concentration is approximately 10-20. G / l, which can be expressed as NaOH 1. 6. Procedures as outlined in claim 11, in which procedure (c) will be partially implemented. The sub-step is (1) the liquid from the mud material. Using the assembly of Second sieve, (2) recirculating most of the removed liquid back to the The interior of the digester is at least approximately the level of the second sieve assembly, (3) Adding liquid for boiling. And the liquid compensation to the liquid that Recycle To produce the increased fluid and (4) the heating of the increased fluid where sub-steps (1) - (4) are performed to return the circulating liquid. Yet again the digester has temperatures between about 140-160 g / l, which can be shown in the form of Alkali concentrations are between approximately 10-20 g / l, which is expressed as NaOH 1. 7. Method as outlined in claim 16, in which procedure (a) will be performed using storage tanks. Wood chips connected to the wood waste pipe Which is connected to the pump with a spiral drive system One is connected to a high-pressure feeder, the other is a feeder 1 8. Method as specified in Clause 16, in which step (3) will be followed by adding Filtered liquid Or water in liquid form for compensation And white liquid In liquid form for boiling