CN102115408B - Method for preparing pentaerythritol with co-production of potassium formate and sodium carbonate - Google Patents
Method for preparing pentaerythritol with co-production of potassium formate and sodium carbonate Download PDFInfo
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- CN102115408B CN102115408B CN 201010611301 CN201010611301A CN102115408B CN 102115408 B CN102115408 B CN 102115408B CN 201010611301 CN201010611301 CN 201010611301 CN 201010611301 A CN201010611301 A CN 201010611301A CN 102115408 B CN102115408 B CN 102115408B
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- filtrate
- formiate
- potassium
- sodium
- solution
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 39
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 title claims abstract description 39
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical compound [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 title claims abstract description 20
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 11
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 30
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 239000000706 filtrate Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical class [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 239000000047 product Substances 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims abstract 17
- 238000001816 cooling Methods 0.000 claims abstract 6
- 229940059574 pentaerithrityl Drugs 0.000 claims description 32
- 235000017550 sodium carbonate Nutrition 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims 5
- 238000004821 distillation Methods 0.000 claims 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims 3
- 239000012047 saturated solution Substances 0.000 claims 3
- 238000010298 pulverizing process Methods 0.000 claims 2
- 238000005352 clarification Methods 0.000 claims 1
- 239000012065 filter cake Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 claims 1
- 235000015320 potassium carbonate Nutrition 0.000 claims 1
- 229910000027 potassium carbonate Inorganic materials 0.000 claims 1
- 235000011181 potassium carbonates Nutrition 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004280 Sodium formate Substances 0.000 abstract 3
- 235000019254 sodium formate Nutrition 0.000 abstract 3
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- JDPWCVZFRRHJLE-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol;nitric acid Chemical compound O[N+]([O-])=O.O[N+]([O-])=O.O[N+]([O-])=O.O[N+]([O-])=O.OCC(CO)(CO)CO JDPWCVZFRRHJLE-UHFFFAOYSA-N 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a method for preparing pentaerythritol with the co-production of potassium formate and sodium carbonate. The method comprises the following steps of: decompressing and distilling waste liquid obtained by the condensation production of pentaerythritol from formaldehyde and acetaldehyde into a saturated pentaerythritol solution, cooling, filtering and separating to obtain a pentaerythritol crystal and a filtrate (1); washing, drying and crushing the pentaerythritol crystal to obtain a pentaerythritol product; decompressing and distilling the filtrate (1) into a saturated sodium formate solution, cooling, filtering and separating to obtain a sodium formate crystal, dissolving the sodium formate crystal in water, making the sodium formate crystal react with a potassium carbonate solution and filtering to obtain a clear filtrate (3); decompressing and distilling the filtrate (3) into a saturated sodium carbonate solution, cooling to 10 DEG C, filtering and separating to obtain a sodium carbonate crystal and a filtrate (4); decompressing and distilling the filtrate (4) to form a supersaturated potassium formate solution, cooling to 10 DEG C, filtering and separating to obtain a potassium formate crystal; and respectively washing, drying and crushing the sodium carbonate crystal and the potassium formate crystal to respectively obtain a sodium carbonate product and a potassium formate product.
Description
Technical field
The present invention relates to the organic chemical industry and produce the improvement of tetramethylolmethane gained waste liquid and the technical field of utilization, especially a kind of method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash, its raw material is for producing tetramethylolmethane gained waste liquid.
Background technology
Tetramethylolmethane is a kind of organic intermediate of having many uses, and is usually used in coatings industry, is the raw material of alkydpaints, and hardness, glossiness and the weather resistance of paint film are improved; Also be used as the abietinic raw materials such as printing-ink of varnish, colored paint, and can make the coating of flame retardant resistance, siccative oil and aero oil lubricate wet goods.Making the tetramethylolmethane tetranitrate take tetramethylolmethane as raw material is volatile explosive.The sour fat of tetramethylolmethane fat can be made softening agent and the stablizer of polyvinyl chloride resin, in addition, also can be used for medicine, agricultural chemicals and lubricated wet goods manufacturing.
Tetramethylolmethane is that condensation makes in the presence of basic catalyst take formaldehyde and acetaldehyde as raw material.Be exactly specifically: 37% formaldehyde is in situation about stirring and sodium hydroxide and acetaldehyde, slowly be warming up to 25-32 degree centigrade with steam, keeping this temperature stirred 6-7 hour, the sulfuric acid that adds with the mole folding hundred such as sodium hydroxide neutralizes, and the filtrate vapourisation under reduced pressure concentrates, crystallization, filtration and drying make finished product.
Produce mother liquor and washing water that tetramethylolmethane gained waste liquid comes inherent filtration and washing.Contain sodium formiate 25%, tetramethylolmethane 6-8%, other organic substances 15% in the mother liquor.One ton of tetramethylolmethane of every production has 3 cubic metres of crystalline mother solutions to discharge approximately.If by yield 80%, then one ton of tetramethylolmethane of every production is wanted 0.6 ton of by-product sodium formiate.With volume calculation unit be: the sodium formiate volume content is 300-500 (g/L), tetramethylolmethane volume content 50-100 (g/L), and the Mother liquid of producing product per ton is the 2-3 ton.
Discharge arbitrarily or abandon if produce tetramethylolmethane gained waste liquid, without affecting environment, also waste raw material, for this reason, be necessary to explore the comprehensive regulation and methods for using them of producing tetramethylolmethane gained waste liquid.
Summary of the invention
Produce tetramethylolmethane with formaldehyde and acetaldehyde condensation, contain sodium formiate 25wt.%, tetramethylolmethane 6-8wt.%, other organic substances 15wt.% in the gained waste liquid.For to its comprehensive regulation and application, the invention provides a kind of method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash, its raw material is that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid.The method, formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid through simple processing treatment, make tetramethylolmethane, potassium formiate and yellow soda ash, take full advantage of formaldehyde and acetaldehyde condensation and produce the potential value of tetramethylolmethane gained waste liquid, and do not produce secondary pollution, being one turns waste into wealth, economic and practical method.
Technical scheme of the present invention is as follows: a kind of method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash, its raw material are that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, comprise the steps:
Steps A: it is the tetramethylolmethane saturated solution through underpressure distillation that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, then cooling, and the tetramethylolmethane crystallization is separated by filtration, and obtains crystals of pentaerythritol and filtrate one; Filtrate one further underpressure distillation is the sodium formiate saturated solution, then cooling, and the sodium formiate crystallization is being separated by filtration, and obtains sodium formiate crystal and filtrate two;
Step B: crystals of pentaerythritol obtained above through washing, dry and pulverizing, is obtained the tetramethylolmethane product;
Step C: sodium formiate crystal obtained above is water-soluble, then with solution of potassium carbonate take the ratio of the molar content of the pure substance of sodium formiate and salt of wormwood as 2: the 0.8-1.2 reaction, obtain containing the solution of potassium formiate and yellow soda ash, after filtration, obtain extremely a small amount of filter cake impurity and the filtrate three of clarification;
Step D: filtrate three is saturated solution of sodium carbonate through underpressure distillation, is cooled to 10 ℃, and at this moment, the saturation ratio of yellow soda ash is 12.2g, the saturation ratio of potassium formiate is 313g, and therefore, crystallize sodium carbonate is separated out, and potassium formiate is separated by filtration still in solution, obtains crystals of sodium carbonate and filtrate four; Filtrate four further underpressure distillation are the potassium formiate supersaturated solution, are cooled to 10 ℃, and at this moment, because the content of yellow soda ash is few in this moment solution, therefore, the potassium formiate mass crystallization is separated out, and is separated by filtration, and obtains the potassium formiate crystal; Crystals of sodium carbonate and potassium formiate crystal advance respectively washing, dry and pulverizing, thereby obtain respectively yellow soda ash product and potassium formiate product.
The method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash of the present invention, its chemical equation:
2HCOONa+K
2CO
3＝＝＝＝2HCOOK+Na
2CO
3
Beneficial effect of the present invention is: the method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash of the present invention, formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid through simple processing treatment, make pentaerythritol with co-production of formic acid potassium and yellow soda ash, take full advantage of formaldehyde and acetaldehyde condensation and produce the potential value of tetramethylolmethane gained waste liquid, and do not produce secondary pollution, being one turns waste into wealth, economic and practical method.The method is simple to operate, and facility investment is few, is worthy of popularization.
Embodiment
Embodiment 1: a kind of method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash, its raw material are that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, and wherein, sodium formiate 25wt.%, tetramethylolmethane 7wt.% comprise the steps:
Steps A: formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid 544kg, are the tetramethylolmethane saturated solution through underpressure distillation, then cooling, and the tetramethylolmethane crystallization is separated by filtration, and obtains crystals of pentaerythritol and filtrate one; Filtrate one further underpressure distillation is the sodium formiate saturated solution, then cooling, and the sodium formiate crystallization is being separated by filtration, and obtains sodium formiate crystal and filtrate two;
Step B: crystals of pentaerythritol obtained above through washing, dry and pulverizing, is obtained the tetramethylolmethane product; The quality of the tetramethylolmethane pure substance that it contains is 38.08kg;
Step C: sodium formiate crystal obtained above is water-soluble, then react as 2: 1.2 with the ratio of solution of potassium carbonate take the molar content of the pure substance of sodium formiate and salt of wormwood, obtain containing the solution of potassium formiate and yellow soda ash, after filtration, obtain extremely a small amount of filter cake impurity and the filtrate three of clarification;
Step D: filtrate three is saturated solution of sodium carbonate through underpressure distillation, is cooled to 10 ℃, and at this moment, the saturation ratio of yellow soda ash is 12.2g, the saturation ratio of potassium formiate is 313g, and therefore, crystallize sodium carbonate is separated out, and potassium formiate is separated by filtration still in solution, obtains crystals of sodium carbonate and filtrate four; Filtrate four further underpressure distillation are the potassium formiate supersaturated solution, are cooled to 10 ℃, and at this moment, because the content of yellow soda ash is few in this moment solution, therefore, the potassium formiate mass crystallization is separated out, and is separated by filtration, and obtains the potassium formiate crystal; Crystals of sodium carbonate and potassium formiate crystal advance respectively washing, dry and pulverizing, thereby obtain respectively yellow soda ash product and potassium formiate product; The quality of the pure substance of the yellow soda ash that it contains is 106kg, and the quality of the pure substance of the potassium formiate that it contains is 168kg.
Embodiment 2:
A kind of method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash, its raw material are that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, and wherein, sodium formiate 25wt.%, tetramethylolmethane 7wt.% comprise the steps:
Steps A: formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid 544kg, are the tetramethylolmethane saturated solution through underpressure distillation, then cooling, and the tetramethylolmethane crystallization is separated by filtration, and obtains crystals of pentaerythritol and filtrate one; Filtrate one further underpressure distillation is the sodium formiate saturated solution, then cooling, and the sodium formiate crystallization is being separated by filtration, and obtains sodium formiate crystal and filtrate two;
Step B: crystals of pentaerythritol obtained above through washing, dry and pulverizing, is obtained the tetramethylolmethane product; The quality of the tetramethylolmethane pure substance that it contains is 38.08kg;
Step C: sodium formiate crystal obtained above is water-soluble, then react as 2: 1 with the ratio of solution of potassium carbonate take the molar content of the pure substance of sodium formiate and salt of wormwood, obtain containing the solution of potassium formiate and yellow soda ash, after filtration, obtain extremely a small amount of filter cake impurity and the filtrate three of clarification;
Step D: filtrate three is saturated solution of sodium carbonate through underpressure distillation, is cooled to 10 ℃, and at this moment, the saturation ratio of yellow soda ash is 12.2g, the saturation ratio of potassium formiate is 313g, and therefore, crystallize sodium carbonate is separated out, and potassium formiate is separated by filtration still in solution, obtains crystals of sodium carbonate and filtrate four; Filtrate four further underpressure distillation are the potassium formiate supersaturated solution, are cooled to 10 ℃, and at this moment, because the content of yellow soda ash is few in this moment solution, therefore, the potassium formiate mass crystallization is separated out, and is separated by filtration, and obtains the potassium formiate crystal; Crystals of sodium carbonate and potassium formiate crystal advance respectively washing, dry and pulverizing, thereby obtain respectively yellow soda ash product and potassium formiate product; The quality of the pure substance of the yellow soda ash that it contains is 106kg, and the quality of the pure substance of the potassium formiate that it contains is 168kg.
Embodiment 3: a kind of method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash, wherein, sodium formiate 25wt.%, tetramethylolmethane 7wt.%, its raw material are that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, comprise the steps:
Steps A: formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid 544kg, are the tetramethylolmethane saturated solution through underpressure distillation, then cooling, and the tetramethylolmethane crystallization is separated by filtration, and obtains crystals of pentaerythritol and filtrate one; Filtrate one further underpressure distillation is the sodium formiate saturated solution, then cooling, and the sodium formiate crystallization is being separated by filtration, and obtains sodium formiate crystal and filtrate two;
Step B: crystals of pentaerythritol obtained above through washing, dry and pulverizing, is obtained the tetramethylolmethane product; The quality of the tetramethylolmethane pure substance that it contains is 38.08kg;
Step C: sodium formiate crystal obtained above is water-soluble, then react as 2: 0.8 with the ratio of solution of potassium carbonate take the molar content of the pure substance of sodium formiate and salt of wormwood, obtain containing the solution of potassium formiate and yellow soda ash, after filtration, obtain extremely a small amount of filter cake impurity and the filtrate three of clarification;
Step D: filtrate three is saturated solution of sodium carbonate through underpressure distillation, is cooled to 10 ℃, and at this moment, the saturation ratio of yellow soda ash is 12.2g, the saturation ratio of potassium formiate is 313g, and therefore, crystallize sodium carbonate is separated out, and potassium formiate is separated by filtration still in solution, obtains crystals of sodium carbonate and filtrate four; Filtrate four further underpressure distillation are the potassium formiate supersaturated solution, are cooled to 10 ℃, and at this moment, because the content of yellow soda ash is few in this moment solution, therefore, the potassium formiate mass crystallization is separated out, and is separated by filtration, and obtains the potassium formiate crystal; Crystals of sodium carbonate and potassium formiate crystal advance respectively washing, dry and pulverizing, thereby obtain respectively yellow soda ash product and potassium formiate product; The quality of the pure substance of the yellow soda ash that it contains is 84.8kg, and the quality of the pure substance of the potassium formiate that it contains is 134.4kg.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, its framework form can be flexible and changeable, can the subseries product.Just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of submitting to.
Claims (1)
1. a method for preparing pentaerythritol with co-production of formic acid potassium and yellow soda ash is characterized in that, its raw material is that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, comprises the steps:
Steps A: it is the tetramethylolmethane saturated solution through underpressure distillation that formaldehyde and acetaldehyde condensation are produced tetramethylolmethane gained waste liquid, then cooling, and the tetramethylolmethane crystallization is separated by filtration, and obtains crystals of pentaerythritol and filtrate one; Filtrate one further underpressure distillation is the sodium formiate saturated solution, then cooling, and the sodium formiate crystallization is being separated by filtration, and obtains sodium formiate crystal and filtrate two;
Step B: crystals of pentaerythritol obtained above through washing, dry and pulverizing, is obtained the tetramethylolmethane product;
Step C: sodium formiate crystal obtained above is water-soluble, then with solution of potassium carbonate take the ratio of the molar content of the pure substance of sodium formiate and salt of wormwood as 2: the 0.8-1.2 reaction, obtain containing the solution of potassium formiate and yellow soda ash, after filtration, obtain extremely a small amount of filter cake impurity and the filtrate three of clarification;
Step D: filtrate three is saturated solution of sodium carbonate through underpressure distillation, is cooled to 10 ℃, and at this moment, the saturation ratio of yellow soda ash is 12.2g, the saturation ratio of potassium formiate is 313g, and therefore, crystallize sodium carbonate is separated out, and potassium formiate is separated by filtration still in solution, obtains crystals of sodium carbonate and filtrate four; Filtrate four further underpressure distillation are the potassium formiate supersaturated solution, are cooled to 10 ℃, and at this moment, because the content of yellow soda ash is few in this moment solution, therefore, the potassium formiate mass crystallization is separated out, and is separated by filtration, and obtains the potassium formiate crystal; Crystals of sodium carbonate and potassium formiate crystal advance respectively washing, dry and pulverizing, thereby obtain respectively yellow soda ash product and potassium formiate product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010611301 CN102115408B (en) | 2010-12-29 | 2010-12-29 | Method for preparing pentaerythritol with co-production of potassium formate and sodium carbonate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010611301 CN102115408B (en) | 2010-12-29 | 2010-12-29 | Method for preparing pentaerythritol with co-production of potassium formate and sodium carbonate |
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| CN102115408B true CN102115408B (en) | 2013-01-09 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254702A (en) * | 1998-11-21 | 2000-05-31 | 衡阳三化实业股份有限公司 | Process for recovering pentaerythritol and protan from mother liquid of pentaerythritol |
-
2010
- 2010-12-29 CN CN 201010611301 patent/CN102115408B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254702A (en) * | 1998-11-21 | 2000-05-31 | 衡阳三化实业股份有限公司 | Process for recovering pentaerythritol and protan from mother liquid of pentaerythritol |
Non-Patent Citations (1)
| Title |
|---|
| 灵通.季戊四醇废液综合利用.《环境污染与防治》.1989,(第3期),41. * |
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Owner name: NANTONG YALUN CHEMICALS CO., LTD. Free format text: FORMER OWNER: WANG JINGYU Effective date: 20131206 |
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Free format text: CORRECT: ADDRESS; FROM: 315000 NINGBO, ZHEJIANG PROVINCE TO: 226314 NANTONG, JIANGSU PROVINCE |
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Effective date of registration: 20131206 Address after: 226314 Jiangsu city of Nantong province Tongzhou District Chuan Jiang town west of Sichuan Patentee after: Nantong Aaron Chemical Co., Ltd. Address before: 58 No. 315000 Zhejiang City Renhe Center City of Ningbo province Haishu District Daqi Gate Street in front of the building Patentee before: Wang Jingyu |
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