TH36494B - Reactive separation - Google Patents

Abstract

DC60 (24/04/46) This invention relates to processes for the manufacture of furfural, for the formation of formic and acetic acids, and for the recovery of formic and acetic acids. tik, in the process- prepare the pulp, in which a mixture of acids Containing mainly formic and acetic acids, it is used as a chemical for pulping, fabrication processes. It is characterized by the use of reactive evaporation and the reuse of the spent pulping liquid. In the evaporator, in the recovery stage of the pulping chemistry, it is also possible to produce furfural, formic acid and acetic acid. more efficiently from the dissolved organic matter Available in pulping fluids and/or chemically bonded acids. contained in it This invention relates to processes for the production of furfural, for the formation of formic and acetic acids, and for the recovery of formic and acetic acids in the pulp preparation process, in which Mixture of acids Containing mainly formic and acetic acids, it is used as a chemical for pulping, fabrication processes. It is characterized by the use of reactive evaporation and the reuse of the spent pulping liquid. In the evaporator, in the recovery stage of the pulping chemistry. So it is also possible to make furfural, formic acid and acetic acid. more efficiently from the dissolved organic matter Available in pulping fluids and/or chemically bonded acids. contained in it

Claims (9)

Disclaimers (all) that will not appear on the advertisement page: 1.Processes for the production of furfural For the formation of formic and acetic acid and for formic acid recovery And acetic acid in the pulp preparation process, which uses a mixture of acid Most of which contain formic acid And acetic acid A chemical for boiling The process consists of pulp preparation, separation of pulp boiling fluid, rinsing liquid pulp, separation of pulp rinsing liquid, recovery of pulp boiling chemicals. And the separation of Furfural And a process consisting of (a) evaporation of spent brewing liquids obtained from liquid separation. For pulp and pulp boiling where the vaporized mixture is obtained is the humidified mix. Formic acid concentration And acetic acid Which was at least partially returned to the pulp and to the pulp washing. And the remainder of the volatile that is obtained is the volatile concentrations in which acetic acid, formic acid and furfural are formed during evaporation from the organic materials contained in the Brewing liquids and / or chemically bonded acids contained therein (b) separation of evaporation concentrates. If desired to be volatile and residual from evaporation (c) separation of water, acetic acid, furfural and formic acid mixtures. And acetic acid From the volatile part And perhaps from the mixture that was evaporated by evaporation (a) by distillation where distillation would include a distillation with aziotropic extraction using ferrfural at (D) return of water to pulp process operation, fraction return Of furfural to the distillation of the (c) process, return of the formic and acetic acid mixture to the pulp preparation and / or rinsing stages. And bringing back the rest Furfural And acetic acid Is characterized by that evaporation (a) is performed at least partially as evaporation. Reactive at 50 to 200 ํ by reuse of used pulp liquids. In the internal circulation of the evaporator Where furfural, formic acid and more acetic acid are It is made up of dissolved organic matter contained in pulping liquids and / or from chemically bonded acids contained in it. 2. The process of claiming the right to claim No. 1, which is characterized by that The process consists of a step (a0) before the separation step (b) in which the evaporation concentrate is This allows the reaction without evaporation. Where furfural, formic acid and acetic acid That is more cheap Built in concentrated substances from evaporation 3. The process, as claimed, in claim 2, is characterized by how step (a0) was performed on the reactive evaporation of the step (a). 4. The process, as it sought to claim No. 3, was characterized by the fact that procedures (a0) were performed in separate areas. Which is connected to the internal circulation of the evaporator 5. Procedures, as for which one of the preceding claims, is characterized by that The reactive evaporation of the step (a) was carried out to the dry solid content of 20 to 95%, useful 50 to 95%. 6. The process of claiming the right to claim No. 1 that is characterized by the Evaporation was performed at temperatures above 90 ํ. 7. The process of claiming the right to claim No. 6 that is characterized by the nature of the office Evaporation was performed at temperatures from 90 to 160 ํ, useful 100 to 140 ํ. 8. The process, as requested in one of the previous claims, is characterized by that the residency time in the evaporator is 0.5 minutes to 24 hours, useful 30 minutes to 5. hour 9. The process, as claimed, in one of the preceding claims, was characterized by supplementation with the pre-concentration pre-evaporation procedure. Reactive of step (a) 1 0. The process of claiming the right to claim No. 9 was characterized by the fact that the act Pre-concentration was performed at a temperature of 45 to 110 ํ 1. 1. Process, as claimed in one of the preceding claims, characterized either before or during reactive evaporation (a) process consists of a process (a1) in which water Or mixtures of acid / water Is added as a liquid or vapor to a dark substance from evaporation 1 2. The process of claiming claim No. 11 that defines the characteristics that The acid / water mixture is filtrate from the water wash of the pulp 1. 3. The procedure for which the claim in Clause 12 was pre-identified. Washing with water The pulp was washed with an acid or a mixture of acids and evaporated to a dry solid content of 30 to 95% 1. 4. Procedures, as for which one of the previous claims, is characterized by that The distillation process with an aziotropic extraction of the distillation step (c) was performed as the first step of the distillation 1. 5. The process of claiming the right in Clause 14 that was characterized by the office Distillation was performed in three columns in such a way that (1) from the bottom of one column was extracted. Mix of formic acid And acetic acid And Furfural leaves And at the top the water and furfural mixture was removed, (2) the product from the bottom of the first column was directed to the second, which from the bottom. Is isolated acetic acid And Furfural leaves And from the top were separated from the right mixes Formic acid concentrate And acetic acid removed, and (3) the product from the very bottom of the column where Two are taken to the third column. Which from the bottom is separated furfural And the acetic acid from the top was removed, and the fururals separated from the bottom were returned to the first column to make Function as a substance for extraction. And the remainder is returned to furfural products 1 6. Process for claiming rights in Clause 14 or 15 that are characterized That formic acid mixtures And acetic acid is separated from the first column into lateral stream 1. 7. The process of claiming the right in Clause 14 that is characterized by that The first distillation procedure was performed using a partition wall column in which the mixture of formic and acetic acid was separated into lateral streams, furfural was separated from the sides. The bottom of the subsequent column and acetic acid from the top. And Furfural was returned to the partition wall column. As a barrier to act as a substance for extraction 1 8. The process of claiming the right to claim No. 17 was characterized as being part For pre-separation of columns with partition walls replaced by separate columns. It is a separate advance part 1. 9. The process of claiming the right to claim No. 18 was characterized by that The product from the top of the pre-separation column is fed to the top and the product from the bottom to the bottom of the subsequent 2 columns. 0. Process for which one of Clause 14 to 19 claims is made Characteristic that the product from the top of the first column is separated into d eddy water and the furfural portion by decantation, the furfural portion is returned to the first column. And part of the water Is taken to the column Where the bottom product is water and the topmost product is a mixture of water and furfural 2. 1. The procedure for which one of the Claims 15 to 16 or 20 is specifically designated that Furfural is separated from the very bottom of the second column. And acetic acid From the second column by the lateral current rectifier And Furfural was returned to that column. One to act as a substance for extraction 2 2. Process for claiming rights in Clause 17 or 21 that are characterized That the furfural is separated from the bottom of the partition wall column and / or acetic acid from the partitioned wall by the lateral current rectifier. And Furfural was sent back. Also a column with partition walls to act as an extraction agent 2 3. The process of claiming clauses 15 to 22, any of which are characterized as being separated from the bottom of the second or third column or column. The fractional part was returned all to the first column to act as an extraction agent and from the decantation fraction of furfural was extracted as an O2 product. 4. The process of claiming the right in Claim No. 23, which is characterized by that division The decantation's furfural is directed to the column where the bottom product is furfural, and the top end product is a mixture of water and furfural 2. 5. The process for which Claim No. 20 or 24 is characterized by That the mixture of water And Furfural was returned to Decantation 2. 6. Procedures for which one of the claims 14 to 25 is required Characteristic that the pressure in the distillation column is 1 to 5 bar 2. 7. Process for which one of the Claims 14 to 25 is required. The peculiarity is that the distillation column is performed at low pressure 2. 8. PROCESS, as requested in any of the previous claims, is characterized by that procedure (b) is supplemented by drying 2. 9. The process of claiming the right to claim No. 28 was characterized by the fact that the act To dry was processed at temperatures above 100 ํ 3. 0. The process of claiming the right to claim No. 28 was characterized by the fact that the act The drying process was performed at low pressure under 120 ํ.