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1. 发明专利

JPH09155101A CRYSTALLIZATION METHOD 失效
公开(公告)号：JPH09155101A
公开(公告)日：1997-06-17
申请号：JP33813995
申请日：1995-12-01
申请人： JGC CORP , MITSUBISHI CHEM CORP
发明人： UNNO HIROSHI , SHIBUYA HIROMITSU , CHIKAMATSU NOBUYASU , KIKUCHI KAZUO , YAMAGISHI MASAHIKO , TAKAHASHI KIYOSHI
IPC分类号： B01D9/02 , B01D9/00 , C07B63/04 , C07C51/43 , C07C57/07
摘要： PROBLEM TO BE SOLVED: To prevent explosion accidents by avoiding polymerization at the time of crystallization of polymerizable compounds such as acrylic acid, methacrylic acid, etc. SOLUTION: In the case of melting of acrylic acid crystal, a polymerization inhibitor is added to a refined melting liquid with the same purity as the crystal and at the same time the refined melting liquid is heated and circulated and supplied to the crystal. In the case of crystallization in multi-stages wherein a crystal melting liquid in a storage tank V-1 is stored in a storage tank V-2 and the melting liquid in the storage tank V-2 and a mother liquid are stored respectively in a next storage tanks V-3 and the prior storage tank V-1, the polymerization inhibitor is previously added, for example, to the storage tank V-3 in the final stage and a product storage tank V-4. Consequently, the polymerization inhibitor can be added automatically to the storage tanks in lower stage (stages where refining degree is low) sides.

2. 发明专利

JPH08281002A CRYSTALLIZER AND CRYSTALLIZING METHOD 失效
公开(公告)号：JPH08281002A
公开(公告)日：1996-10-29
申请号：JP11132795
申请日：1995-04-12
申请人： JGC CORP , MITSUBISHI CHEM CORP
发明人： KIKUCHI KAZUO , UNNO HIROSHI , SHIBUYA HIROMITSU , SAKAKURA YASUYUKI , TAKAHASHI KIYOSHI
IPC分类号： B01D9/02
摘要： PURPOSE: To provide a crystallizer and a crystallizing method for performing mass production of crystalline materials of high purity while crystals are prevented from being dropped off. CONSTITUTION: A plate 2 in which a projection part 3 is arranged on one side thereof is vertically arranged, and a liquid raw material is caused to flow down on one side 22 of the plate, and also on the other side thereof, a refrigerant of temperature not more than the freezing point of crystals is caused to flow down in the form of a thin film, allowing the crystals to be grown with a part of the crystal layer on one side 22 of the plate 2 being held on the projection part 3. Next, on the other side 23 of the plate, a heating medium of temperature above the freezing point of the crystals is caused to flow down in the form of a thin film, allowing the crystals to be melted and recovered. Here since a part of supporting force of the crystal layer is borne by the projection part 3, the crystal layer is prevented from being peeled from the plate.

3. 发明专利

JPH07163802A METHOD FOR CRYSTALLIZATION AND CRYSTALLIZER 失效
公开(公告)号：JPH07163802A
公开(公告)日：1995-06-27
申请号：JP26636294
申请日：1994-10-04
申请人： JGC CORP , MITSUBISHI CHEM CORP
发明人： KIKUCHI KAZUO , UNNO HIROSHI , SHIBUYA HIROMITSU , MAKINO MASAHITO , SAKAKURA YASUYUKI , TAKAHASHI KIYOSHI
IPC分类号： B01D9/02 , B01D9/00
摘要： PURPOSE:To produce a large amt. of crystals with high purity by means of a simple and large apparatus by a method wherein a liq. raw material is made to flow down on one face side of a vertical plate and a cooling medium with a temp. being at least m.p. of this liq. raw material is made to flow down on another face side to deposit crystals and then, a heating medium is made to flow down. CONSTITUTION:A base plate 11 for adhesion of crystals is stood up vertically and a liq. raw material 14 contg. crystallizable component is fed circulatedly on one face side 12 of this plate and is made to flow down into a thin film. In addition, a cooling medium 15 with a temp. being at least m.p. of the liq. raw material 14 is made to flow down on another face side 13 of the plate 11 to deposit crystals on one face side 12 of the plate 11 and the crystal layer is gradually grown. When the thickness of the crystal layer reaches a specified value, uncrystallized remaining liq. is extracted and a heating medium with a temp. being at least m.p. of the crystals constituting the crystal layer is made to flow down into a thin film on another face side 13 of the plate 11 to melt gradually the crystals, which are recovered below. Treatment like this is performed by multi-stages.

4. 发明专利

JPH09157212A CRYSTALLIZATION OF ACRYLIC ACID OR METHACRYLIC ACID 失效
公开(公告)号：JPH09157212A
公开(公告)日：1997-06-17
申请号：JP33813895
申请日：1995-12-01
申请人： JGC CORP , MITSUBISHI CHEM CORP
发明人： UNNO HIROSHI , SHIBUYA HIROMITSU , YAMAGUCHI KATSUMASA , SAKAKURA YASUYUKI , TAKAHASHI KIYOSHI
IPC分类号： C07C57/07
摘要： PROBLEM TO BE SOLVED: To inexpensively carry out crystallization of acrylic acid or methacrylic acid in good efficiency of heat exchange by simple apparatus and operation. SOLUTION: A crude acrylic acid containing impurity is charged into a crystallizing tank 2 and liquefied propylene is fed thereto under atmospheric pressure. Since three phases are kept in coexistence state by feeding the liquefied propylene to crude acrylic acid under atmospheric pressure, propylene in liquid state is vaporized while absorbing calorie corresponding to evaporation heat from acrylic acid and changed into gaseous state and, on the other hand, acrylic acid is cooled by evaporation heat of propylene, and thereby crystals are deposited. Consequently, since acrylic acid is cooled from the interior to deposite crystals, crystals are hardly attached to wall face of the crystallizing tank and the heat transfer area is hardly made insufficient and lowering in efficiency of heat exchange can be suppressed. Since the operation is carried out under atmospheric pressure, apparatus constitution and operation are simplified.

5. 发明专利

JPH0655063A LIQUID-LIQUID CONTACTING TOWER 失效
公开(公告)号：JPH0655063A
公开(公告)日：1994-03-01
申请号：JP25303692
申请日：1992-09-22
申请人： JGC CORP , MITSUBISHI PETROCHEMICAL CO
发明人： NAKAYAMA TAKASHI , UNNO HIROSHI , SAKAKURA YASUYUKI , TAKAHASHI KIYOSHI
IPC分类号： B01D11/04 , B01J14/00 , B01J19/00
摘要： PURPOSE:To obtain high contact efficiency by alternately arranging a split flow plate having a liquid passage consisting of plural slits and a baffle plate in such a shape that it covers the passage in the gravitational direction and having a liquid passage in its periphery in a tower and making the opening area ratio of the liquid passage of the baffle plate larger than that of the split flow plate. CONSTITUTION:A heavy liquid is fed from the upper part of a tower 1 and a light liquid is fed from the lower part and both the liquids whose one liquid becomes a dispersed phase and the other becomes a continuous phase are given continuous countercurrent contact in the tower 1. In the liquid-liquid contacting tower 1 of this type, a split flow plate 2 traversing in the tower 1 and horizontally expanding and having a liquid passage 3 consisting of plural slit and/or holes and a baffle plate 4 expanding so that it may cover the liquid passages 3 of the split flow plate 2 in the gravitational direction and having a liquid passage 5 between its periphery and the inner wall of the tower 1 and having a passage opening area ratio larger than that of the split flow plate 2 are alternatively arranged at suitable vertical intervals. Consequently, the dispersed phase is retained by the split flow plates 2 to form a united layer.

6. 发明专利

JP2003164703A METHOD FOR ATTACHING LEVEL GAUGE 审中-公开
公开(公告)号：JP2003164703A
公开(公告)日：2003-06-10
申请号：JP2001369636
申请日：2001-12-04
申请人： MITSUBISHI CHEM CORP
发明人： YADA SHUHEI , OGAWA YASUYUKI , TAKAHASHI KIYOSHI , SUZUKI YOSHIRO
IPC分类号： G01F23/14 , B01D3/00 , B01D3/42 , C07C51/44 , C07C57/04 , C07C67/54 , C07C69/54
摘要： PROBLEM TO BE SOLVED: To provide a method for attaching a level gauge to a production apparatus for an easily polymerizable compound, i.e., a method for attaching a level gauge which prevents the occurrence and deposition of solids of a liquid to be measured on the high-pressure-side detection section of the level gauge and enables continuous accurate measurement and continuous operation of the apparatus over a long time. SOLUTION: This method is used in attaching the level gauge to a point for storing the liquid containing the easily polymerizable compound in the production apparatus for the easily polymerizable compound. The high-pressure-side detection line of the level gauge is connected to an extraction line for the liquid stored. COPYRIGHT: (C)2003,JPO

7. 发明专利

JP2000344688A PURIFICATION OF READILY POLYMERIZABLE COMPOUND 失效
公开(公告)号：JP2000344688A
公开(公告)日：2000-12-12
申请号：JP15764199
申请日：1999-06-04
申请人： MITSUBISHI CHEM CORP
发明人： YAMAGISHI MASAHIKO , TAKAHASHI KIYOSHI , SAKAKURA YASUYUKI
IPC分类号： C07B63/00 , C07C7/04 , C07C7/20 , C07C15/46 , C07C51/44 , C07C51/50 , C07C57/075 , C07C67/54 , C07C67/62 , C07C69/54
摘要： PROBLEM TO BE SOLVED: To provide a method for purifying a readily polymerizable compound containing a polymerizable double bond in the molecule such as acrylic acid, methacrylic acid, an acrylic acid ester, a methacrylic acid ester, styrene, etc., efficiently, safely and inexpensively by distillation under reduced pressure. SOLUTION: In distilling a liquid containing a readily polymerizable compound such as acrylic acid, methacrylic acid, their esters, styrene, etc., a cooling/ condensing apparatus for vapor at the top of a distillation column is installed so as to make its condensation face vertical and a polymerization inhibitor is made to exist on the condensation face. Effectively a solution containing the polymerization inhibitor is sprayed on the top of the condensation face of the cooling/condensing apparatus.

8. 发明专利

JP2000281617A PURIFICATION OF ACRYLIC ACID 失效
公开(公告)号：JP2000281617A
公开(公告)日：2000-10-10
申请号：JP2000012995
申请日：2000-01-21
申请人： MITSUBISHI CHEM CORP
发明人： YADA SHUHEI , YAMAGISHI MASAHIKO , KASAMATSU KOJI , SAKAKURA YASUYUKI , TAKAHASHI KIYOSHI
IPC分类号： C07C57/07 , C07C51/44 , C07C51/46 , C07C57/05 , C07C57/055
摘要： PROBLEM TO BE SOLVED: To provide an operation condition capable of stably operating a distillation column by preventing the polymerization of acrylic acid when an aqueous solution of acrylic acid is dehydrated and distilled. SOLUTION: In purifying acrylic acid from an aqueous solution of acrylic acid by carrying out dehydration distillation by using a dehydration distillation column B, a distillation column having >=3 theoretical plates is used as the distillation column B and the operation temperature of a part corresponding to the second plate of the theoretical plates is set at a temp. of 50-70 deg.C.

9. 发明专利

JPH0834757A PURIFICATION OF ACRYLIC ACID 失效
公开(公告)号：JPH0834757A
公开(公告)日：1996-02-06
申请号：JP17522494
申请日：1994-07-27
申请人： MITSUBISHI CHEM CORP
发明人： TAKAHASHI KIYOSHI , HOSAKA HIROCHIKA
IPC分类号： C07B63/00 , C07C57/07
摘要： PURPOSE:To provide an inexpensive and efficient method for purifying acrylic acid in production of acrylic acid. CONSTITUTION:This purifying method comprises subjecting propylene and (or) acrolein to catalytic vapor phase oxidation using a molecular oxygen-containing gas, cooling the produced gas and (or) absorbing the produced gas into water to afford a crude acrylic acid aqueous solution, subjecting the aqueous solution or a crude acrylic acid aqueous solution obtained by previously removing aldehydes in the aqueous solution by stripping to azeotropic distillation under reflux together with a nonhydrophilic azeotropic agent capable of forming an azeotropic mixture with acetic acid and recovering the purified acrylic acid from the tower bottom of azeotropic distillation tower used. In this method, an azeotropic agent is additionally fed from at least one place which is located more downstream than feed source of the reflux flow of azeotropic distillation tower in addition to the azeotropic agent as a reflux flow and the azeotropic distillation is carried out and acrylic acid substantially containing no acetic acid is recovered from the tower bottom.

10. 发明专利

JP2003183219A METHOD OF PRODUCING (METH)ACRYLIC ACID 审中-公开
公开(公告)号：JP2003183219A
公开(公告)日：2003-07-03
申请号：JP2001381867
申请日：2001-12-14
申请人： MITSUBISHI CHEM CORP
发明人： YADA SHUHEI , TAKAHASHI KIYOSHI , TAKASAKI KENJI , OGAWA YASUYUKI , JINNO KIMIKATSU , SUZUKI YOSHIRO
IPC分类号： B01D3/14 , C07C51/44 , C07C57/07
摘要： PROBLEM TO BE SOLVED: To attain stabilized distillation operation for a long period of time, when the production volume of (meth)acrylic acid is altered, as the distillation column is kept from being blocked by monomer polymerization. SOLUTION: In the (meth)acrylic acid production process that has the purification step in which the crude distillate including (meth)acrylic acid is fed to the distillation column and distilled, the liquid-gas flow rate in the distillation column is set to ≥(100-α/2)% based on the liquid-gas flow rate in the normal operation, when the (meth)acrylic acid production is reduced by α% based on the normal operation. COPYRIGHT: (C)2003,JPO

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