公开(公告)号：JPH09249597A

公开(公告)日：1997-09-22

申请号：JP5562596

申请日：1996-03-13

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  OTAKE KATSUTO

IPC: C08J11/02 ,  C07B37/06 ,  C07C27/02 ,  C07C31/20 ,  C07C67/475 ,  C07C69/76 ,  C07C69/82 ,  C08J11/24

Abstract: PROBLEM TO BE SOLVED: To decompose an aromatic polyester into an aromatic dihydric carboxylic acid in a form of methyl ester and a dihydric alcohol in a short time and recover these monomers in a high yield by reacting the aromatic polyester with a supercritical methanol. SOLUTION: An aromatic polyester (e.g. polyethylene terephthalate) is reacted with a supercritical methanol to provide dimethyl aromatic dihydric carboxylic acid and a dihydric alcohol. The reaction is preferably carried out by packing the aromatic polyester and methanol into a reactor and heating the reactor under supercritical conditions of methanol. The supercritical conditions are preferably 523-653K deg. temperature and 5 to 25MP pressure. Methanol is preferably used in a ratio of 20-70mol based on 1mol aromatic dihydric carboxylic aid contained in the aromatic polyester. The aromatic dihydric carboxylic acid dimethyl ester and the dihydric alcohol can be recovered from the reaction product in high purity from a method such as distillation or crystallization.

公开(公告)号：JPH03287550A

公开(公告)日：1991-12-18

申请号：JP8873890

申请日：1990-04-03

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  NAKAZAWA NOBUAKI ,  YAMANE SUMIYO

IPC: C07C7/10 ,  C07C7/14 ,  C07C15/20

Abstract: PURPOSE:To safely, inexpensively and simply separate a polycyclic aromatic compound in a energy-saving state from a mixture such as petroleum refined oil or coal tar with supercritical carbon dioxide as a extraction and crystallization solvent. CONSTITUTION:A raw material mixture is charged into an extraction tank 7 and super critical carbon dioxide is fed into the extraction tank 7 through a high pressure pump 2 and a pre-heating coil 5 to extract the mixture with the super critical carbon dioxide. The temperature and pressure of the extraction tank 7 are controlled with an air constant temperature bath and a back pressure valve 3. After the extraction the super critical fluid containing the mixture is fed from the constant temperature tank 10 into a crystallization tank 12 maintained at a prescribed temperature and only the objective component in the mixture is deposited. The super critical fluid containing the solutes in the crystallization tank is substituted with the pure super critical fluid and subsequently the pressure in the tank is reduced to the atmospheric pressure to recover the component. Since the process can be operated at a relatively low temperature, the pyrolysis and polymerization of the target substance can be prevented.

公开(公告)号：JP2001089129A

公开(公告)日：2001-04-03

申请号：JP26477899

申请日：1999-09-20

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YODA SATOSHI ,  OTAKE KATSUTO ,  TAKEBAYASHI YOSHIHIRO ,  SUGATA TAKESHI ,  SAKO TAKESHI

IPC: B01J3/00 ,  C01B33/16

Abstract: PROBLEM TO BE SOLVED: To solve the problems of conventional process for the impregnation of a metal compound in a wet silica gel in liquid phase comprising the long time necessary for the impregnation into the gel depending on the kind and concentration of the compound and the formation of an insufficiently impregnated product to cause frequent failure in getting a monolithic composite material of metal compound and silica aerogel. SOLUTION: A dry medium mixed with a metal compound is impregnated in a wet silica gel and dried to obtain a silica aerogel composed of the metal compound and silica particles forming a composite material. In the above process, both of the impregnation process and the drying process are carried out under supercritical condition of the dry medium to obtain the objective monolithic composite material of metal compound and silica aerogel.

公开(公告)号：JP2000281830A

公开(公告)日：2000-10-10

申请号：JP8966999

申请日：1999-03-30

Applicant: KUMAMOTO PREFECTURE ,  AGENCY IND SCIENCE TECHN

Inventor： SUGATA TAKESHI ,  SAKO TAKESHI ,  OTAKE KATSUTO ,  NAGAOKA SHOJI ,  NAGATA MASANORI

IPC: B09B3/00 ,  B29B17/04 ,  C01B31/02 ,  C08J11/16 ,  C08J11/22 ,  C08K3/04 ,  C08L61/06

Abstract: PROBLEM TO BE SOLVED: To provide the methods for separating and purifying carbon material that comprises the removal of resol resin or novolak resins from the carbon material without damage to the carbon material at a low temperature efficiently without occurrence of injurious or harmful substance on the outside of the system and provide the purification of the carbon material. SOLUTION: A carbon material-containing resin of crushed resol resin or novolak resin is allowed to react in a basic organic solvent of >=0.5 M of alkali concentration and contains 20 to 100 vol.% of water at 300-400 deg.C in the reactor to remove the resol resin or novolak resin component from the carbon material. Then, the carbon material is washed and purified whereby the carbon material is recovered from the carbon material-containing resin.

公开(公告)号：JPH11323006A

公开(公告)日：1999-11-26

申请号：JP15063298

申请日：1998-05-14

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SAKO TAKESHI ,  KANZAWA CHIYOJI ,  SUGATA TAKESHI ,  OKAJIMA IZUMI

IPC: C08J11/10 ,  C08J11/14 ,  C10G1/06

Abstract: PROBLEM TO BE SOLVED: To provide a method for decomposing a plastic multilayer molded product comprising a polycondensation polymer film layer and a polyaddition polymer film layer into reusable components without using a catalyst. SOLUTION: This method for decomposing a plastic multilayer molded product comprises bringing 1 pt.wt. of the fine pieces of the plastic multilayer molded product comprising a polycondensation polymer film layer and a polyaddition polymer film layer into contact with 5-100 pts.wt. of high temperature and high pressure water capable of melting but not decomposing the polyaddition polymer, thus decomposing the polycondensation polymer film into monomer components, dissolving the monomer components in water and transferring the polyaddition polymer film as the non-decomposed solid product into the water, subsequently separating and recovering the non-decomposed solid product of the polyaddition polymer film from the water containing the monomer components produced by the decomposition of the polycondensation polymer film, and finally separating and recovering the dissolved monomers produced by the decomposition of the polycondensation polymer film from the obtained separated water. The method for oiling the polyaddition polymer solid product comprises bringing the polyaddition polymer solid product obtained by the decomposition method into contact with high temperature and high pressure water heated at the higher temperature than the decomposition temperature of the solid product.

公开(公告)号：JPH1087872A

公开(公告)日：1998-04-07

申请号：JP26124096

申请日：1996-09-09

Applicant: AGENCY IND SCIENCE TECHN ,  KUMAMOTO PREFECTURE

Inventor： SUGATA TAKESHI ,  NAKANE TAKASHI ,  SAKO TAKESHI ,  OTAKE KATSUTO ,  UENO KATSUHIKO ,  SATO SHINJI ,  NAGAOKA SHOJI ,  NAGATA MASANORI ,  NAGAYAMA SANPEI ,  KAMIMURA MAKOTO

IPC: C08J11/10

Abstract: PROBLEM TO BE SOLVED: To enable reinforcing fibers to be separated, recovered, and reused efficiently without damaging the fibers by bringing a fiber-reinforced plastic into contact and reaction with (sub)supercritical water. SOLUTION: After a fiber-reinforced plastic is charged into a reactor 1 and water supplied from a water cylinder 2 to a water tank 3 is charged into the reator 1 through a high-pressure pump 4 so that water occupies 1-50vol.% of the reactor 1, valves 5, 6 are closed and the reactor 1 is hermetically sealed. Then, a heat exchanger 8 and the reactor 1 are heated to 320-500 deg.C with a constant temp. bath 7 to bring water in the reactor 1 into a (sub)supercritical state. The reinforced plastic is brought into contact with the water in a (sub) supercritical state and thus is reacted. The reactor 1 is then returned to normal temp. and the valve 6 is opened to separate and recover a gaseous part contg. hydrocarbons, carbon dioxide, nitrogen, etc., through a trap 9.

公开(公告)号：JPH02142739A

公开(公告)日：1990-05-31

申请号：JP29580188

申请日：1988-11-22

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  NAKAZAWA NOBUAKI ,  OKUBO TEIJI ,  SUZUKI MORIO ,  WAKABAYASHI KATSUHIKO

IPC: B01J29/12 ,  B01J29/08 ,  B01J29/22 ,  C07B61/00 ,  C07C5/27 ,  C07C9/12 ,  C07C9/16

Abstract: PURPOSE:To industrially and advantageously isomerize a 4-10C n-paraffin into a paraffin having side chains without adding H2 gas into a reaction system by using a solid catalyst in a mixed fluid of the reactant and product in a supercritical state. CONSTITUTION:A 4-10C n-paraffin is introduced into a reactor filled with a solid catalyst supporting Pt on Y type zeolite, etc., and isomerized under conditions of higher reaction temperature and reaction pressure than the critical temperature and pressure of a mixed fluid consisting of the reactant and product in the reaction vessel without adding H2 gas into the reaction system. The mixed fluid of the unreacted reactant and the product emerging from the reactor is then decompressed to take out the paraffin as an isomerized paraffin product having side chains.

公开(公告)号：JPS63216845A

公开(公告)日：1988-09-09

申请号：JP5098487

申请日：1987-03-05

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SAKAKI KEIJI ,  SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  SUZUKI OSAMU ,  NAKAZAWA NOBUAKI ,  SHIRATA TOSHIKATSU ,  YOKOCHI TOSHIHIRO

IPC: C07C67/56 ,  C07C69/58 ,  C11B3/10 ,  C11B7/00

Abstract: PURPOSE:To obtain the titled compound inexpensively, in high yield and harmlessly to human body without requiring removal of organic solvent by vacuum distillation, by fractionating gamma-linolenic acid containing natural fats and oils by chromatography using a supercritical fluid as a mobile phase. CONSTITUTION:gamma-Linolenic acid-containing natural fats and oils are fractionated by chromatography using a supercritical fluid as a mobile phase and a gamma- linolenic acid-containing glyceride fraction is collected to give the aimed com pound. A hydrocarbon such as methane or ethane besides carbon dioxide and freon is used as the supercritical fluid. The supercritical condition is >=72.4kg/cm pressure and >=31.0 deg.C temperature in the case of carbon dioxide. A small amount of ethanol, butane, etc., having 40-120 deg.C boiling point is added to the supercritical fluid so that separating performance is improved. The partial collection condition by the supercritical chromatography is preferably 35-60 deg.C temperature and 90-250kg/cm pressure.