公开(公告)号：JPH02108682A

公开(公告)日：1990-04-20

申请号：JP25990388

申请日：1988-10-14

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SUGATA TAKESHI ,  NAKAZAWA NOBUAKI ,  OGAWA HIROTSUGU ,  SATO SHINJI ,  SAKO TAKESHI ,  OKUBO TEIJI ,  WAKABAYASHI KATSUHIKO

IPC: C07D307/50 ,  C07B61/00

Abstract: PURPOSE:To efficiently obtain highly concentrated furfural by extracting aqueous solution, etc., containing pentose such as xylose by using acid as catalyst and using supercritical fluid. CONSTITUTION:In a process producing furfural from aqueous solution containing pentose such as xylose or hemicellulose in plant body using acid as catalyst, a fluid having temperature and pressure exceeding critical temperature and critical pressure is made into contact with reacting liquid in reacting vessel and circulated, then furfural is extracted and recovered to outside of the reaction system. Preferably, the supercritical fluid containing furfural is circulated through a filling column having structure refluxing a part of concentrated liquid and the other concentrating column, thus concentration of furfural is enriched.

公开(公告)号：JPH02274269A

公开(公告)日：1990-11-08

申请号：JP9612089

申请日：1989-04-14

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SUGATA TAKESHI ,  OKUBO TEIJI ,  SATO SHINJI ,  SAKO TAKESHI ,  NAKAZAWA NOBUAKI

IPC: A62D3/00 ,  B01D53/34 ,  B01D53/70

Abstract: PURPOSE:To easily constitute a process of rendering fluorocarbon or fluorocarbon-containing materials harmless and prevent emission of harmful materials out of a system by decomposing the fluorocarbon or fluorocarbon- containing materials inside a high temperature - high pressurized water in a temperature and a pressure (supercritical) condition exceeding the critical temperature and critical pressure. CONSTITUTION:A high temperature - high pressurized water is fed to a reactor together with a fluorocarbon or fluorocarbon-containing material. As the conditions of that time, a temperature exceeding the critical temperature of water, for example, 380 deg.C or more, and a pressure over the critical pressure of water, for example, 300atm or more, are preferred. The feed quantity of fluorocarbon is preferably less than 1/100 by mole ratio to water. When the fluorocarbon is chlorofluoromethane containing no hydrogen, the greater part is hydrolyzed in this reactor, forming carbon dioxide water, and hydrogen halide. The hydrogen halide in the product is neutralized by alkali and made harmless.

公开(公告)号：JPH02291942A

公开(公告)日：1990-12-03

申请号：JP11270589

申请日：1989-05-01

Applicant: AGENCY IND SCIENCE TECHN

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

IPC: G01N11/16

Abstract: PURPOSE:To make it possible to measure the coefficient of viscosity simply and accurately by constituting an apparatus with a vibrator, a circuit for grounding a housing, a variable capacitor, dielectric-loss measuring device, and a balance detector. CONSTITUTION:A torsional vibrator 1 is held in a sample fluid cell 3 with housings 2. The inside of the cell 3 is filled with a fluid to be measured. Electrodes which are provided on the surfaces of the vibrator 1 are connected to the measuring bridge terminals of a dielectric-loss measuring device 4 through conductor wires 5. A synthesizer 6 which imparts a frequency input and a bal ance detector 7 which detects the balance of the bridge are connected to the corresponding terminals of the measuring device 4. The housing 2 is grounded to the grounding terminal of the bridge through a conductor wire 8. Thus the effect of the housing 2 in measurement is removed. A zero-position moving variable capacitor 9 which is connected to the vibrator 1 in parallel is prepared. The capacitance of the capacitor 9 is selected in measuring the width of a half value. Therefore, the zero position of the capacitance of the dielectric-loss measuring device corresponding to the capacitance of the capacitor 9 can be arbitrarily selected.

公开(公告)号：JPH02275752A

公开(公告)日：1990-11-09

申请号：JP9162289

申请日：1989-04-11

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OTAKE TAKESHI ,  UCHIDA KUNIO ,  KAWAMURA MITSUTAKA ,  OKUBO TEIJI ,  IGASAKI FUMIKAZU

IPC: C04B35/00 ,  C04B35/18

Abstract: PURPOSE:To obtain feedstock for mullite ceramics in low costs by forming a mixture of deironated and decarbonized coal ash and alumina and firing the products. CONSTITUTION:Alumina is added to deironated and decarbonized coal ash, the mixture is formed and fired to give the subject material. The ash is reduced less than 2wt.% in iron and less than 0.5wt.% in carbon. The deironation treatment is carried out by using a magnetic separator, when needed, followed by treatment with hydrochloric acid or sulfuric acid. The decarbonization is effected in order to reduce carbon residue (including unchanged coal) by calcinating at 800 to 900 deg.C after deironation. Unsatisfactory pretreatment forms foams during the firing of the formed products. The residual iron causes colored (red brown) products with market value reduced.

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.