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：JPS62254810A

公开(公告)日：1987-11-06

申请号：JP9895186

申请日：1986-04-28

Applicant: AGENCY IND SCIENCE TECHN

Inventor： TERAJIMA KAZUO ,  OGAWA HIROTSUGU ,  TOMITA SHIGERU

IPC: B01D17/06 ,  B01D17/00 ,  B01D17/05 ,  C02F1/46 ,  C02F1/463 ,  C02F1/465

Abstract: PURPOSE:To effectively separate and remove oil from emulsifying oil waste water with less electric power in a short time by adding a difficulty soluble polyvalent metallic compd. to the emulsifying oil waste water, and impressing a voltage between both electrodes. CONSTITUTION:The emulsifying oil waste water is charged in an electrolytic cell provided with the electrodes, the additive consisting of a difficulty soluble polyvalent metallic compd. such as the oxides of calcium, magnesium, etc., is added to the water and sufficiently dispersed, and then a voltage is impressed between both electrodes. Consequently, the surface activity of the emulsifier is decreased by electrolytic oxidation, the polyvalent metallic ions are eluted by the electrolytic oxidation of the additive and agglomerated, and oil is floated and separated by gaseous oxygen and hydrogen generated by electrolysis. As a result, oil can be efficiently separated from the emulsifying oil waste water by the synergetic effect of the above-mentioned actions.

公开(公告)号：JPH03245464A

公开(公告)日：1991-11-01

申请号：JP4198190

申请日：1990-02-22

Applicant: AGENCY IND SCIENCE TECHN

Inventor： UEDA MINORU ,  WATANABE AKIO ,  OGAWA HIROTSUGU ,  TERAJIMA KAZUO

IPC: C02F1/461 ,  C02F1/467 ,  H01M4/90

Abstract: PURPOSE:When a gas diffusion electrode is manufactured by coating a reaction layer containing a catalyst laminatedly on a hydrophobic porous gas transmission layer provided with a collector, to make the manufacture of the electrode easy by using lead dioxide as the catalyst in the reaction layer. CONSTITUTION:A gas diffusion electrode is constructed with a hydrophobic porous gas transmission layer 1, a reaction layer 2 containing a material consisting of lead dioxide carried on carbon black, and a collector 3. As for the collector 3, a copper mesh of 32 in mesh number is used, and as for raw materials of the hydrophobic porous gas transmission layer 1 a mixture of powder composed of hydrophobic acetylene black mixed with 40wt.% of PTFE is used. As for raw materials of the reaction material containing a catalyst to be contacted to an electrolyte, a mixture of respective equal amounts of extra pure reagent lead dioxide powder containing 20wt.% of PTFE and hydrophobic acetylene black powder containing 30wt.% of PTFE is used. Thereby a gas diffusion electrode of high oxidation efficiency and hard to generate deactivation due to poison can be obtained.

公开(公告)号：JPH01202300A

公开(公告)日：1989-08-15

申请号：JP2588288

申请日：1988-02-05

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OGAWA HIROTSUGU ,  KUNIHISA KAZUKO

IPC: C13K1/02

Abstract: PURPOSE:To saccharify cellulose with secondary decomposition of the saccharides inhibited by solubilizing celluloses with zinc chloride, then hydrolyzing them. CONSTITUTION:Woods, wastes from agriculture and forestry of used paper, as a raw material of cellulose, is combined with an aqueous solution of zinc chloride in 60-75% concentration at room temperature to 60 deg.C to dissolve the cellulose. The solution is cooled down to room temperature and diluted with water to precipitate non-crystalline cellulose. The precipitate is rinsed with water, combined with 1-10% of a mineral acid so that the final concentration of the mineral acid becomes 0.2-5%. Then, the mixture is saccharified by heating at 100-200 deg.C for 1-120min, while the zinc chloride solution separated from the regenerated cellulose is adjusted in its concentration and reused to dissolve the cellulose material.

公开(公告)号：JPS6283087A

公开(公告)日：1987-04-16

申请号：JP22337685

申请日：1985-10-07

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OGAWA HIROTSUGU ,  TERAJIMA KAZUO ,  TOMITA SHIGERU

IPC: C02F1/463 ,  B01D17/06 ,  C02F1/46 ,  C02F1/465

Abstract: PURPOSE:To easily separate an oil component, by decomposing the emulsifier in waste water containing emulsified oil by electrolytic oxidation to allow the surface activity thereof to disappear. CONSTITUTION:Waste water containing emulsified oil is introduced into an electrolytic cell wherein an anode is equipped with lead dioxide and a cathode is equipped with an insoluble electrode and electrolytic voltage of 5-20V is applied to both electrodes at temp. of ambient temp.-60 deg.C. By this method, an emulsifier is decomposed and an oil component can be easily separated. Because the oil component insoluble in water receives no electrolytic oxidation, treatment can be performed regardless of the kind of the emulsifier and the kind of the oil component.