CN114163311A - High-efficiency and clean production method of phenolic compound - Google Patents

High-efficiency and clean production method of phenolic compound Download PDF

Info

Publication number
CN114163311A
CN114163311A CN202010984758.9A CN202010984758A CN114163311A CN 114163311 A CN114163311 A CN 114163311A CN 202010984758 A CN202010984758 A CN 202010984758A CN 114163311 A CN114163311 A CN 114163311A
Authority
CN
China
Prior art keywords
mother liquor
hydrolyzed
polar protic
acidic
acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010984758.9A
Other languages
Chinese (zh)
Inventor
王兴路
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010984758.9A priority Critical patent/CN114163311A/en
Publication of CN114163311A publication Critical patent/CN114163311A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/01Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis
    • C07C37/045Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis by substitution of a group bound to the ring by nitrogen
    • C07C37/05Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by replacing functional groups bound to a six-membered aromatic ring by hydroxy groups, e.g. by hydrolysis by substitution of a group bound to the ring by nitrogen by substitution of a NH2 group
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/68Purification; separation; Use of additives, e.g. for stabilisation
    • C07C37/685Processes comprising at least two steps in series
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/68Purification; separation; Use of additives, e.g. for stabilisation
    • C07C37/70Purification; separation; Use of additives, e.g. for stabilisation by physical treatment
    • C07C37/72Purification; separation; Use of additives, e.g. for stabilisation by physical treatment by liquid-liquid treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

An efficient and clean production method of a phenolic compound comprises the following steps: adding corresponding arylamine compound into a certain amount of acidic catalyst aqueous solution, heating for hydrolysis, cooling to room temperature, adding an extraction solvent to extract a generated phenolic compound, separating the extraction solvent from an extraction liquid to prepare a finished phenolic compound product, evaporating residual extraction solvent and partial water from the extracted acidic mother liquor, mixing a certain amount of polar protic solvent to precipitate inorganic ammonium salt in the mother liquor, dissolving salt formed by the arylamine compound which is not hydrolyzed and is incompletely hydrolyzed and the acidic catalyst and excessive acidic catalyst in the polar protic solvent, separating the inorganic ammonium salt precipitate, further distilling to remove the polar protic solvent, sleeving the salt of the arylamine compound which is not hydrolyzed and is incompletely hydrolyzed and the excessive acidic catalyst in the synthesis of the next batch, and continuing the hydrolysis reaction.

Description

High-efficiency and clean production method of phenolic compound
The technical field is as follows: the invention belongs to the technical field of chemical raw material synthesis, and particularly designs an efficient and clean production method of a phenolic compound.
Secondly, background art: the phenolic compounds are important chemical raw materials, have wide application fields, are closely related to the production and the life of human beings, and can be applied to medicines, pesticides, veterinary drugs, materials, auxiliaries, dyes, pigments, coatings, adhesives, plastics, rubber, electronic chemicals and the like. There are a variety of methods for preparing such compounds, including: sulfonate alkali fusion method, amino compound acid hydrolysis method, amino diazotization hydrolysis method, hydrogen peroxide hydroxylation method, isopropyl compound oxidation hydrolysis method, halogenated hydrocarbon alkali hydrolysis method, hydroxylamine rephotography method and the like.
Due to localization or environmental protection, safety, technology, resources, and the like, with the development of science and technology and materials, the acidic hydrolysis of aromatic amines to convert the amino group of aromatic amines into hydroxyl group to prepare corresponding phenolic compounds gradually becomes some of the main industrial preparation methods of phenolic compounds, such as: p-methylphenol, m-methylphenol, 2-naphthol, 1-naphthol, m-hydroxybenzoic acid, p-hydroxybenzoic acid, 3, 5-dimethylphenol, p-phenylphenol, hydroquinone, resorcinol, 2, 4-dihydroxytoluene, 2-methylresorcinol, phloroglucinol, 1, 5-dihydroxynaphthalene, 3, 5-dihydroxybenzoic acid, 2, 5-dimethylphenol, 3, 4-dimethylphenol, 8-hydroxyquinoline, 4-hydroxydiphenylamine and the like.
The main reaction processes are exemplified as follows:
1. p-methylaniline is hydrolyzed in acid to prepare p-cresol:
Figure BSA0000220008140000011
2. m-phenylenediamine is hydrolyzed in acid to prepare resorcinol:
Figure BSA0000220008140000012
3. preparing m-hydroxybenzoic acid from m-aminobenzoic acid:
Figure BSA0000220008140000013
4.2, 4-diaminotoluene acidic hydrolysis to prepare 2, 4-dihydroxytoluene:
Figure BSA0000220008140000014
5. 2, 6-diaminotoluene acidic hydrolysis to prepare 2, 6-dihydroxytoluene:
Figure BSA0000220008140000015
the common acids for hydrolyzing the arylamine compounds comprise sulfuric acid, ammonium bisulfate, hydrochloric acid, hydrobromic acid, phosphoric acid and the like, when the arylamine compounds are hydrolyzed by a conventional method to prepare corresponding phenolic compounds, the excessive amount of the acids is more when the sulfuric acid is used as a catalyst, the utilization rate of acid radicals is less than 50 percent, mother liquor after the phenolic compounds are extracted is generally introduced into ammonia gas to neutralize residual acidity, a byproduct ammonium sulfate is prepared after concentration, and raw materials and intermediates which are not hydrolyzed are difficult to recover and utilize; the ammonium bisulfate is used as a catalyst, the excessive acid is also large, the generated ammonium sulfate needs high temperature when being converted into the ammonium bisulfate, and the raw materials and intermediates remained by hydrolysis are damaged and are difficult to be continuously utilized; phosphoric acid is used as a catalyst, the phosphoric acid is used in a large excess amount, in the existing documents, after the phosphoric acid aqueous solution after hydrolysis is supplemented with consumed phosphoric acid, the phosphoric acid aqueous solution is continuously used for 5-6 times, so that the utilization rate of the catalyst and raw materials is improved, but finally, a large amount of acidic mixed mother liquor by-product cannot be treated, the raw materials and intermediates which are not hydrolyzed completely are difficult to recover and utilize, and a large amount of phosphoric acid has to be neutralized by ammonia to prepare ammonium phosphate by-product.
However, no matter how the arylamine compound is hydrolyzed, a certain amount of waste acid is generated, not only part of raw materials and intermediates are mixed, but also alkaline substances are required to be added for neutralization so as to treat the waste mother liquor, so that more waste salt impurities are generated, the environmental hazard is large, and the product yield is low.
Thirdly, the invention content: (1) the purpose of the invention is as follows: the invention aims to overcome a series of problems of incomplete hydrolysis reaction, low raw material conversion rate, low utilization efficiency of a catalyst for neutralization treatment of a hydrolysis mother liquor, large environmental hazard and the like in the production of corresponding phenolic compounds by using corresponding arylamine compounds through acidic hydrolysis of the known phenolic compounds, and finds a method for recycling the stable hydrolysis catalyst and ammonium salt generated by simple precipitation of the mother liquor so as to improve the product yield and the utilization efficiency of the catalyst, reduce the environmental hazard and form a high-efficiency, clean and safe process method for preparing the phenolic compounds.
(2) The technical scheme is as follows: through a large number of experimental researches, the invention discovers that in sulfuric acid, ammonium bisulfate, phosphoric acid, hydrochloric acid and hydrobromic acid used for preparing corresponding phenolic compounds by hydrolyzing various conventional arylamine compounds, inorganic ammonium salts formed by the sulfuric acid, the ammonium bisulfate, the phosphoric acid, the hydrochloric acid and the hydrobromic acid have lower solubility in polar protic solvents, but amine salts formed by the arylamine compounds have certain solubility, inorganic ammonium salts generated by hydrolysis reaction can be precipitated and separated from a hydrolysis reaction system through proper design, and the amine salts formed by the arylamine compounds and an acid catalyst are circularly sleeved for the hydrolysis reaction after separating the polar protic solvents, so that the efficient and clean cyclic process for preparing the phenolic compounds by acidic hydrolysis of the arylamine compounds is formed.
(3) The technical effects are as follows: the invention relates to a high-efficiency and clean production method of phenolic compounds, which comprises the steps of adding corresponding arylamine compounds into a certain amount of acidic catalyst aqueous solution, heating for hydrolysis, cooling to room temperature, adding an extraction solvent to extract the generated phenolic compounds, separating the extraction solvent from an extraction liquid to prepare a finished phenolic compound product, evaporating residual extraction solvent and partial water from an extracted acidic mother solution, mixing a certain amount of polar protic solvent to precipitate inorganic ammonium salts in the mother solution, dissolving salts formed by the arylamine compounds and the acidic catalysts which are not hydrolyzed and are incompletely hydrolyzed and excessive acidic catalysts and the polar protic solvent into the polar protic solvent, separating the inorganic ammonium salts precipitate, further distilling to remove the polar protic solvent, and sleeving the salts of the arylamine compounds which are not hydrolyzed and incompletely hydrolyzed and the excessive acidic catalysts for the synthesis of the next batch, the hydrolysis reaction is continued. Thus, the product yield is improved, the use efficiency of the catalyst is improved, the environmental hazard is reduced, and the process method is efficient, clean and safe.
The concrete aspects are as follows:
1. the polar protic solvent is adopted as the precipitation solvent, so that the generated inorganic ammonium salt has low solubility in the polar protic solvent, and the polar protic solvent is added to be easily precipitated, so that the acidic catalyst in the hydrolysis mother liquor is conveniently recycled, the use efficiency of the catalyst is improved, the production cost is reduced, and the environmental hazard is reduced.
2. The invention adopts polar protic solvent as precipitation solvent, and the salt formed by the arylamine compound without hydrolysis and incomplete hydrolysis and the catalyst can be dissolved in the polar protic solvent, so that part of the compound can be continuously recycled to the hydrolysis reaction, thereby improving the conversion rate of raw materials, reducing the production cost and reducing the environmental hazard.
Fourthly, the specific implementation mode of the invention is as follows:
example 1: adding 176g of 85 percent phosphoric acid and 201.5g of water into a 500ml hydrolysis reaction tank, uniformly mixing, then adding 27g of 2, 4-diaminotoluene, replacing with nitrogen, pressurizing and heating to 230-240 ℃ for reaction for 6 hours, cooling to obtain 391.2g of hydrolysate (loss is 13.3g), transferring the hydrolysate into a separating funnel, adding 50ml of butyl acetate each time for extraction for 4 times, combining extract liquor, adding magnesium sulfate for drying, decoloring with active carbon, removing butyl acetate in vacuum, adding toluene for crystallization, filtering and drying to obtain 22.5g of light brown 2, 4-dihydroxytoluene (molar yield is 82%)
Heating the extracted acidic mother liquor to evaporate an azeotrope of butyl acetate and water, adding 320g of residual acidic mother liquor into 1500g of methanol to separate out transparent crystals, washing and filtering the crystals by using the methanol, drying the crystals to obtain 39g of ammonium dihydrogen phosphate (TLC analysis, almost organic matters), continuously heating the mother liquor to evaporate the methanol, and continuously heating the mother liquor to evaporate the methanol to obtain 250g of residual mother liquor (TCL analysis, 2, 4-diaminotoluene and other components), titrating and analyzing to contain 103.5g of phosphoric acid, and storing for next batch of hydrolysis and reuse.
Example 2: adding 51g of 85 percent phosphoric acid and 82g of water into a 500ml hydrolysis reaction tank, uniformly mixing, then adding 27g of 2, 4-diaminotoluene, then using 245g of the mother liquor recovered in the example 1 again, replacing with nitrogen, then pressurizing and heating to 230-240 ℃ for reaction for 6 hours, cooling to obtain 393g of hydrolysate (loss of 12g), transferring the hydrolysate into a separating funnel, adding 50ml of butyl acetate each time for extraction for 4 times, combining the extract liquor, adding magnesium sulfate for drying, decoloring with active carbon, removing butyl acetate in vacuum, adding toluene for crystallization, filtering and drying to obtain 25.5g of light brown 2, 4-dihydroxytoluene (molar yield 92.9%)
Heating the extracted acidic mother liquor to evaporate an azeotrope of butyl acetate and water, adding residual 322g of the acidic mother liquor into 1500g of methanol, separating out transparent crystals, washing and filtering the crystals by using methanol, drying the crystals to obtain 45.5g of ammonium dihydrogen phosphate (TLC analysis, almost organic substances), continuously heating the mother liquor to evaporate methanol, and continuously heating the residual 255g of the mother liquor (TCL analysis, 2, 4-diaminotoluene and other components), titrating and analyzing to obtain 106g of phosphoric acid, and storing for next batch of hydrolysis and reuse.
Example 3: adding 90g of 98% sulfuric acid and 280g of water into a 500ml hydrolysis reaction tank, uniformly mixing, then adding 46g of m-phenylenediamine, replacing with nitrogen, pressurizing and heating to 230-240 ℃ for reaction for 6 hours, cooling to obtain 401g of hydrolysate, (loss of 15g), transferring the hydrolysate into a separating funnel, adding 80ml of butyl acetate for extraction for 4 times, combining extract liquor, adding magnesium sulfate for drying, decoloring with activated carbon, removing butyl acetate in vacuum, adding toluene for crystallization, filtering, and drying to obtain 39.8g of light brown resorcinol (molar yield of 85%)
Heating the extracted acidic mother liquor to evaporate azeotrope of butyl acetate and water, adding residual 290g of acidic mother liquor into 1500g of ethanol, separating out transparent crystals, washing with ethanol, filtering, drying the crystals to obtain 79g of ammonium bisulfate (TLC analysis, almost organic matter), continuously heating the mother liquor to evaporate ethanol, and continuously heating the residual 185g of mother liquor (TCL analysis, containing components such as m-phenylenediamine and the like), titrating to analyze that the sulfuric acid contains 4.2g, and storing the mother liquor for next hydrolysis.
Example 4: adding 90g of 98% sulfuric acid and 118g of water into a 500ml hydrolysis reaction tank, applying 182g of mother liquor recovered in example 3, uniformly mixing, adding 46g of m-phenylenediamine, replacing with nitrogen, pressurizing, heating to 230-240 ℃ for reaction for 6 hours, cooling to obtain 424g of hydrolysate (loss of 12g), transferring the hydrolysate into a separating funnel, adding 80ml of butyl acetate each time for extraction for 4 times, combining extract liquor, adding magnesium sulfate for drying, decoloring with active carbon, removing butyl acetate in vacuum, adding toluene for crystallization, filtering, and drying to obtain 44.3g of light brown resorcinol (molar yield 94.5%)
Heating the extracted acidic mother liquor to evaporate an azeotrope of butyl acetate and water, adding 305g of residual acidic mother liquor into 1500g of ethanol, separating out transparent crystals, washing with ethanol, filtering, drying the crystals to obtain 90.5g of ammonium bisulfate (TLC analysis, almost organic matter), continuously heating the mother liquor to evaporate ethanol, collecting 194g of residual mother liquor (TCL analysis, containing components such as m-phenylenediamine and the like), titrating to analyze that the sulfuric acid contains 7.9g, and storing the mother liquor for next hydrolysis.
Example 5: adding 190g of 90% ammonium bisulfate and 210g of water into a 500ml hydrolysis reaction tank, uniformly mixing, then adding 27g of 2, 4-diaminotoluene, performing nitrogen replacement, pressurizing and heating to 230-240 ℃ for reaction for 6 hours, cooling, then discharging 414g of hydrolysate, (losing 13g), transferring the hydrolysate into a separating funnel, adding 50ml of butyl acetate for extraction for 4 times each time, combining extract liquor, adding magnesium sulfate for drying, decoloring by activated carbon, removing butyl acetate in vacuum, adding toluene for crystallization, filtering, and drying to obtain 20.5g of light brown 2, 4-dihydroxytoluene (molar yield 74.7%)
Heating the extracted acidic mother liquor to evaporate an azeotrope of butyl acetate and water, adding 343g of residual acidic mother liquor into 700g of methanol, separating out transparent crystals, washing and filtering the crystals by using the methanol, drying the crystals to obtain 42g of diammonium sulfate (TLC analysis, almost organic matter), continuously heating the mother liquor to evaporate methanol, and continuously heating the mother liquor to evaporate 272g of residual mother liquor (TCL analysis, containing 2, 4-diaminotoluene and other components), titrating and analyzing to obtain 122g of ammonium bisulfate, and storing for next batch of hydrolysis and reuse.
Example 6: adding 50g of 90% ammonium bisulfate and 80g of water into a 500ml hydrolysis reaction tank, then using 267g of the mother liquor recovered in the example 5, uniformly mixing, then adding 27g of 2, 4-diaminotoluene, replacing with nitrogen, pressurizing and heating to 230-240 ℃ for reaction for 6 hours, cooling to obtain 413g of hydrolysate (loss of 11g), transferring the hydrolysate into a separating funnel, adding 50ml of butyl acetate for extraction for 4 times each time, combining extract liquor, adding magnesium sulfate for drying, decoloring with activated carbon, removing butyl acetate in vacuum, adding toluene for crystallization, filtering and drying to obtain 23.7g of light brown 2, 4-dihydroxytoluene (molar yield 86.4%)
Heating the extracted acidic mother liquor to evaporate an azeotrope of butyl acetate and water, adding residual 315g of the acidic mother liquor into 700g of methanol, separating out transparent crystals, washing and filtering the crystals by using methanol, drying the crystals to obtain 48.5g of diammonium sulfate (TLC analysis, almost organic matters), continuously heating the mother liquor to evaporate methanol, and continuously heating the residual 254g of the mother liquor (TCL analysis, 2, 4-diaminotoluene and other components), titrating and analyzing 116g of ammonium bisulfate, and storing for next batch of hydrolysis and reuse.
The invention relates to a clean production method of a phenolic compound, which solves a series of problems of low raw material conversion rate, neutralization treatment of hydrolysis mother liquor, large environmental hazard and the like existing when corresponding aromatic amine compounds are used for producing corresponding phenolic compounds through acidic hydrolysis of the known phenolic compounds Clean and safe. The method has the advantages of easily available raw materials, suitability for batch and continuous production, high automation degree, no need of using an alkaline neutralizing agent to treat wastewater, safety, environmental protection, high yield, good quality and low cost, and can be used for industrial production. The invention has the advantages of low investment cost, low production and driving risk and rich operating profit.
Finally, it is to be noted that: although the present invention has been described in detail with reference to the foregoing examples, those skilled in the art may still modify the technical solutions described in the foregoing examples, or equivalently replace some technical features of the embodiments, or simply change the technical solutions of the present invention into continuous engineering. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An efficient and clean production method of a phenolic compound comprises the following steps: adding corresponding arylamine compound into a certain amount of acidic catalyst aqueous solution, heating for hydrolysis, cooling to room temperature, adding an extraction solvent to extract a generated phenolic compound, separating the extraction solvent from an extraction liquid to prepare a finished phenolic compound product, evaporating residual extraction solvent and partial water from the extracted acidic mother liquor, mixing a certain amount of polar protic solvent to precipitate inorganic ammonium salt in the mother liquor, dissolving salt formed by the arylamine compound which is not hydrolyzed and is incompletely hydrolyzed and the acidic catalyst and excessive acidic catalyst in the polar protic solvent, separating the inorganic ammonium salt precipitate, further distilling to remove the polar protic solvent, sleeving the salt of the arylamine compound which is not hydrolyzed and is incompletely hydrolyzed and the excessive acidic catalyst in the synthesis of the next batch, and continuing the hydrolysis reaction.
2. The producible phenolic compounds as claimed in claim 1 include, but are not limited to: p-methylphenol, m-methylphenol, 2-naphthol, 1-naphthol, m-hydroxybenzoic acid, 3, 5-dimethylphenol, p-phenylphenol, hydroquinone, resorcinol, 2, 4-dihydroxytoluene (4-methylresorcinol), 2, 6-dihydroxytoluene (2-methylresorcinol), phloroglucinol, 1, 5-dihydroxynaphthalene, 3, 5-dihydroxybenzoic acid, 2, 5-dimethylphenol, 3, 4-dimethylphenol, 8-hydroxyquinoline, 4-hydroxydiphenylamine, and mixtures of two or more thereof.
3. The hydrolysis reaction as claimed in claim 1, wherein the acid catalyst comprises: sulfuric acid, ammonium bisulfate, phosphoric acid, hydrochloric acid, hydrobromic acid.
4. The hydrolysis reaction as claimed in claim 1 or 3, wherein the number of moles of the effective acidic groups in the aqueous acidic catalyst solution is 1 to 20 times, preferably 2 to 8 times, the number of moles of the amino groups in the aromatic amine compound.
5. The acidic mother liquor after extraction as claimed in claim 1, the mother liquor after distilling off the residual extraction solvent and part of the water content is controlled to a water content of from 1% to 90%, preferably from 30% to 60%.
6. The polar protic solvent as claimed in claim 1, comprising: methanol, ethanol, isopropanol, and ethylene glycol.
7. The amount of polar protic solvent as claimed in claims 1 and 6 added is from 1 to 20 times, preferably from 2 to 8 times, the total amount of mother liquor.
CN202010984758.9A 2020-09-11 2020-09-11 High-efficiency and clean production method of phenolic compound Pending CN114163311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010984758.9A CN114163311A (en) 2020-09-11 2020-09-11 High-efficiency and clean production method of phenolic compound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010984758.9A CN114163311A (en) 2020-09-11 2020-09-11 High-efficiency and clean production method of phenolic compound

Publications (1)

Publication Number Publication Date
CN114163311A true CN114163311A (en) 2022-03-11

Family

ID=80476108

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010984758.9A Pending CN114163311A (en) 2020-09-11 2020-09-11 High-efficiency and clean production method of phenolic compound

Country Status (1)

Country Link
CN (1) CN114163311A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE823455A (en) * 1972-06-29 1975-06-17 RESORCINOL MANUFACTURING PROCESS
US3933925A (en) * 1972-06-29 1976-01-20 Koppers Company, Inc. Hydrolysis of toluene diamines to produce methyl resorcinols
GB1437167A (en) * 1974-12-09 1976-05-26
JPH07242604A (en) * 1994-01-13 1995-09-19 Sumitomo Chem Co Ltd Production of 4,6-diaminoresorcinol and its precursor
CN102826961A (en) * 2012-08-14 2012-12-19 江苏扬农化工集团有限公司 Cycling treatment method for waste acid produced in production of hydroquinone
CN102911018A (en) * 2011-08-04 2013-02-06 浙江龙盛化工研究有限公司 Method for separating phenol-containing organic substances from m-phenylenediamine acidic hydrolysate
CN103848724A (en) * 2014-03-18 2014-06-11 南京工业大学 Process for producing resorcinol by hydrolyzing m-phenylenediamine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE823455A (en) * 1972-06-29 1975-06-17 RESORCINOL MANUFACTURING PROCESS
US3933925A (en) * 1972-06-29 1976-01-20 Koppers Company, Inc. Hydrolysis of toluene diamines to produce methyl resorcinols
GB1437167A (en) * 1974-12-09 1976-05-26
JPH07242604A (en) * 1994-01-13 1995-09-19 Sumitomo Chem Co Ltd Production of 4,6-diaminoresorcinol and its precursor
CN102911018A (en) * 2011-08-04 2013-02-06 浙江龙盛化工研究有限公司 Method for separating phenol-containing organic substances from m-phenylenediamine acidic hydrolysate
CN102826961A (en) * 2012-08-14 2012-12-19 江苏扬农化工集团有限公司 Cycling treatment method for waste acid produced in production of hydroquinone
CN103848724A (en) * 2014-03-18 2014-06-11 南京工业大学 Process for producing resorcinol by hydrolyzing m-phenylenediamine

Similar Documents

Publication Publication Date Title
CN111620796B (en) Cyclic process for the production of taurine
US10604478B1 (en) Method for producing taurine and method for removing impurity from reaction system for producing taurine
US8658828B2 (en) Recovery of toluene diamine from tar waste residue discharged from synthesis process of toluene diisocyanate
US20180162806A1 (en) Process for producing taurine
CN111646881B (en) Synthetic method of m-trifluoromethyl phenol
CN102584569A (en) Method for preparing diphenolic acid in ionic liquid
CN110845424B (en) Preparation method of 5-acetoacetylaminobenzimidazolone
CN110105619B (en) Controllable degradation recovery method of polyurethane
CN111333525A (en) Continuous production process of β -alanine
CN1189455C (en) Method for preparing hydroxymethylthiobutyric acid
CN113120925B (en) Method for recovering iodide from isophorone cracking material
CN102030703A (en) Method for preparing piperidine nitroxide radical polymerization inhibitor
CN114163311A (en) High-efficiency and clean production method of phenolic compound
CN103553925A (en) Process for synthesizing nitrocyclohexane by liquid phase nitration
CN111606335B (en) Clean comprehensive utilization method of potassium salt-containing mother liquor
CN112142624A (en) Method for synthesizing N, N' -diisopropylcarbodiimide by using oxygen as oxidant
CN111559959A (en) Synthetic method of p-trifluoromethylphenol
CN115611758B (en) Method for producing sarcosine
CN103254095B (en) Separating and purifying method in iobitridol preparation process
CN109912423B (en) Green synthesis process of 3, 5-dinitro-4-methylbenzoic acid
CN110683954A (en) Method for preparing isooctyl nitrate by recycling waste acid
CN114213293A (en) Preparation method of methionine
CN111569887B (en) Application of magnetic microspheres in alcoholysis recovery of colored waste polyester
CN113735717A (en) Treatment method of 37% nitric acid in pendimethalin process
CN107827821B (en) Continuous flow clean production process of pyrazolone series products

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination