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1.发明授权Method and plant for reprocessing waste sulphuric acids from nitration processes 有权从硝化过程中再处理废硫酸的方法和设备公开(公告)号：US09108847B2
公开(公告)日：2015-08-18
申请号：US13395810
申请日：2010-09-08
Applicant: Gottfried Dichtl , Harald Steeg
Inventor： Gottfried Dichtl , Harald Steeg
CPC classification number: C01B21/46 , B01D3/143 , B01D3/148 , B01J2219/00006 , C01B17/94
Abstract: A method for reprocessing waste acid from methods for producing nitro-aromatics, in particular for producing dinitrotoluene (DNT) or trinitrotoluene (TNT), to recover concentrated and purified sulfuric acid and nitric acid, wherein in a first stage, the waste acid is separated in a stripping column countercurrently with water vapor from the bottom of the stripping column into at least one vapor phase, which contains nitric acid and possibly nitro-organics, and a pre-concentrated sulfuric acid, and the vapor phase and the pre-concentrated sulfuric acid are condensed and/or reprocessed in downstream method stages, wherein in the first stage of the method, in addition to the stripping, the nitric acid contained in the stripping vapor is concentrated in the presence of additional concentrated sulfuric acid so that nitric acid in a highly concentrated form suitable for feeding back into the nitration process is obtained directly in the first stage.
Abstract translation: 一种用于生产硝基芳族化合物的方法，特别是用于生产二硝基甲苯（DNT）或三硝基甲苯（TNT））来回收浓缩和纯化的硫酸和硝酸的废酸的方法，其中在第一阶段废物酸被分离 在汽提塔中与从汽提塔底部的水蒸汽逆流流入含有硝酸和可能的硝基有机物的至少一个气相，以及预浓缩硫酸，以及气相和预浓缩硫酸 酸在下游方法阶段被冷凝和/或再处理，其中在该方法的第一阶段中，除了汽提之外，在另外的浓硫酸的存在下将汽提蒸气中所含的硝酸浓缩，使得硝酸在 直接在第一阶段获得适合反硝化过程的高浓缩形式。
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公开(公告)号：US4155989A
公开(公告)日：1979-05-22
申请号：US851584
申请日：1977-11-14
Applicant: Ralph Miller
Inventor： Ralph Miller
CPC classification number: C01B17/94
Abstract: Mixtures of nitric acid and sulfuric acid containing in excess of 70% sulfuric acid are denitrated by the addition of sufficient sulfur dioxide to such mixtures to convert the nitric acid to gaseous nitrogen oxides and vaporizing them from the solution in which they are formed. The process is particularly valuable for the treatment of spent nitration acids.
Abstract translation: 含有超过70％硫酸的硝酸和硫酸的混合物通过向这种混合物中加入足够的二氧化硫来将硝酸转化为气态氮氧化物并从它们形成的溶液蒸发它们进行脱硝。 该方法对于处理用过的硝化酸是特别有价值的。
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公开(公告)号：US2971819A
公开(公告)日：1961-02-14
申请号：US70806258
申请日：1958-01-10
Applicant: MONSANTO CHEMICALS
Inventor： ANTELMAN MARVIN S
IPC: C01B17/94
CPC classification number: C01B17/94
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公开(公告)号：US2337025A
公开(公告)日：1943-12-21
申请号：US38902241
申请日：1941-04-17
Applicant: DU PONT
Inventor： BATCHELDER GEORGE W , FEATHERER RALPH L , HUGHES JESSE E
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公开(公告)号：US2315988A
公开(公告)日：1943-04-06
申请号：US36022640
申请日：1940-10-08
Applicant: DU PONT
Inventor： SOMERS NORMAN C , WOODINGS JR WALTER CREWS
IPC: C01B17/94
CPC classification number: C01B17/94
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Patent Agency Ranking
公开(公告)号：US5955050A
公开(公告)日：1999-09-21
申请号：US877087
申请日：1997-06-17
Applicant: Drew John Drexler
Inventor： Drew John Drexler
CPC classification number: C01B17/94
Abstract: A process is provided for the destruction of nitrogen oxides in sulfuric acid by adding a reducing agent, such as hydrazine, sulfamic acid or urea, and an oxidizing agent, such as hydrogen peroxide or persulfates, into the nitrogen oxides contaminated sulfuric acid. The nitrogen oxides contaminated sulfuric acid is treated at a temperature between 15.degree. C. and 100.degree. C.
Abstract translation: 提供了通过向氮氧化物污染的硫酸中加入还原剂如肼，氨基磺酸或尿素以及氧化剂如过氧化氢或过硫酸盐来破坏硫酸中的氮氧化物的方法。 氮氧化物污染的硫酸在15℃至100℃的温度下进行处理
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公开(公告)号：US3830904A
公开(公告)日：1974-08-20
申请号：US25304272
申请日：1972-05-15
Applicant: LILLY CO ELI
Inventor： CHIASSON W , RUSSELL R
IPC: C01B17/94
CPC classification number: C01B17/94
Abstract: FLUORIDE, BOTH ORGANIC AND INORGANIC, IS REMOVED FROM SPENT ACID DERIVED FROM A NITRIC ACID-SULFURIC ACID NITRATING MIXTURE FROM THE NITRATION OF P-TRIFLUOROMETHYLPHENYLCHLORIDE BY TREATING SAID SPENT ACID WITH A SOURCE OF SILICON AT ELEVATED TEMPERATURES.
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公开(公告)号：US2366309A
公开(公告)日：1945-01-02
申请号：US45381242
申请日：1942-08-06
Applicant: DU PONT
Inventor： BATCHELDER GEORGE W , FEATHERER RALPH L , HUGHES JESSE E
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公开(公告)号：US2355702A
公开(公告)日：1944-08-15
申请号：US45401742
申请日：1942-08-07
Applicant: DU PONT
Inventor： BROOKS WINSLOW A
IPC: C01B17/94
CPC classification number: C01B17/94
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公开(公告)号：US20220002155A1
公开(公告)日：2022-01-06
申请号：US17286450
申请日：2019-10-17
Applicant: PLINKE GMBH
Inventor： Hansjürgen WINTERBAUER
Abstract: In a process for workup of mixed acid and wastewater from the nitration of aromatics in which the nitric acid present is converted by reaction with an aromatic under adiabatic conditions, a. at least one waste stream component selected from waste acid (mixed acid) generated in the nitration, acidic washing water from the workup of crude nitroaromatics and dilute nitric acid generated in an off-gas treatment in the course of the nitration is provided, b. the at least one waste stream component is mixed with re-concentrated sulfuric acid, c. an aromatic is added to the mixture in stoichiometric excess based on the nitric acid, d. the obtained reaction mixture is reacted in an adiabatically operated reactor, e. the obtained organic phase is separated from the sulfuric-acid-containing phase in a separator, f. the sulfuric-acid-containing phase is concentrated under vacuum and g. at least one substream of the re-concentrated sulfuric acid from step g) is employed in step b).
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