-
公开(公告)号：DE3477006D1
公开(公告)日：1989-04-13
申请号：DE3477006
申请日：1984-12-20
Applicant: DAICEL CHEM
Inventor： YAMASHITA MITSURU , SHIMA KOJI
IPC: C08B3/06
Abstract: Cellulose acetate is effectively prepared from cellulose and acetic anhydride in a solvent of acetic acid in the presence of a catalyst of sulfuric acid, when the reaction system is being evacuated at least before the reaction mixture reaches a boiling point thereof until the reaction completes, so that the vapor evolved from the reaction mixture may be condensed to distill off and the reaction product may be concentrated.
-
公开(公告)号：EP0112926A4
公开(公告)日：1984-11-21
申请号：EP83902130
申请日：1983-07-06
Applicant: DAICEL CHEM
Inventor： KOGA KUNIO , SHIMA KOJI , SAMEJIMA MUTSUMI
Abstract: A process for recovering acetic acid, which comprises extracting acetic acid from an aqueous solution of acetic acid containing metal sulfates with an organic extracting agent consisting of a tertiary amine and an organic diluent, and recovering acetic acid from the extract, wherein the organic extracting agent is a mixture of a tertiary amine containing sulfuric acid and an organic diluent. This process enables to reduce energy consumption and raise extraction efficiency.
Abstract translation: 一种回收乙酸的方法，该方法包括用含叔胺和有机稀释剂的有机萃取剂从含金属硫酸盐的乙酸水溶液中萃取乙酸，并从萃取物中回收乙酸，其中有机萃取剂 是含有硫酸的叔胺和有机稀释剂的混合物。 该过程能够降低能耗并提高提取效率。
-
公开(公告)号：JPH0699552B2
公开(公告)日：1994-12-07
申请号：JP16747386
申请日：1986-07-16
Applicant: DAICEL CHEM
Inventor： TAKAGI MOTOMI , SHIMA KOJI
-
公开(公告)号：JPH02164841A
公开(公告)日：1990-06-25
申请号：JP31801788
申请日：1988-12-16
Applicant: DAICEL CHEM
Inventor： UENO TAKASHI , SHIMA KOJI
Abstract: PURPOSE:To obtain the subject compound in high efficiency by adding an acidic compound and a compound capable of forming a complex with rhodium to a reaction system and carbonylating an alpha-arylethyl alcohol in the presence of the rhodium catalyst and an iodine compound under specific condition. CONSTITUTION:The subject compound useful as an analgesic, anti-inflammatory and antipyretic agent is produced by reacting (A) an alpha arylethyl alcohol with CO in the presence of (B) a rhodium catalyst and (C) an iodine compound. In the above process, the atomic ratio of Rh:I in the components B and C is adjusted to 1: (0.5-1.6) and the reaction system is added with (D) a compound capable of forming a complex with Rh (especially phosphine) and (E) an acidic compound (especially an organic acid or inorganic acid) in such a manner as to get an Rh:D molar ratio of 1: (0.01-10) and an A:E molar ratio of 1: (0.1-5). The process is profitable because the objective compound can be produced in high yield and high space-time yield at decreased catalyst concentration and suppressed formation of by-products without lowering the rate of reaction even under a high reaction pressure.
-
公开(公告)号：JPH0278639A
公开(公告)日：1990-03-19
申请号：JP23133388
申请日：1988-09-14
Applicant: DAICEL CHEM
Inventor： SAEKI KAZUHIKO , SHIMA KOJI
IPC: B01J23/58 , B01J38/00 , C07B61/00 , C07C27/00 , C07C29/145 , C07C33/20 , C07C33/30 , C07C33/46 , C07C67/00
Abstract: PURPOSE:To recover Pd catalyst by solid-liquid separation after completion of reaction and the aimed substance and an alkaline metallic promoter by liquid-liquid separation and to recycle the Pd catalyst and the alkaline metallic promoter in obtaining the title substance by hydrogenating an aromatic ketone in the presence of a Pd carrying catalyst and an alkaline metallic promoter by using water as a reaction solvent. CONSTITUTION:A compound shown by the formula (R' is H, 1-5C alkyl, 1-2C alkoxy or halogen; R'' is alkyl or arylalkyl) is reacted in the presence of a Pd carrying catalyst and an alkaline metallic promoter (e.g., NaOH or potassium acetate) at 50-150 deg.C using water as a reaction solvent to give the title substance. After the reaction is over, the Pd catalyst is recovered by solid-liquid separation, successively the aimed substance is separated from an aqueous solution containing the promoter by liquid-liquid separation and the Pd catalyst and the aqueous solution containing the promoter are returned to the reaction system. The aimed substance is obtained in 100% selectivity, rapidly by simpler facilities and economically.
-
Patent Agency Ranking
公开(公告)号：JPH0262837A
公开(公告)日：1990-03-02
申请号：JP21211688
申请日：1988-08-26
Applicant: DAICEL CHEM
Inventor： SAEKI KAZUHIKO , SHIMA KOJI
Abstract: PURPOSE:To produce an aromatic carbinol useful as a raw material for drugs and agricultural chemicals with a few side reactions industrially and advantageously without requiring a specific device by using an organic amine as a promoter and hydrogenating an aromatic ketone in the presence of a palladium catalyst. CONSTITUTION:An aromatic ketone (e. g., p-isobutylacetophenone) shown by the formula (R' is H, 1-5C alkyl, 1-2C alkoxy or halogen, R'' is alkyl or arylalkyl) is hydrogenated in the presence of a palladium catalyst supported on a carrier to give an aromatic carbinol [e. g., (p-isobutylphenyl) methylcarbinol]. In the reaction, 0.4-0.6 pt.wt. based on 1 pt.wt. palladium supporting catalyst of an organic amine, especially pyridine or triethylamine is present as a promoter. The method has no problems such as precipitation of alkali hydroxide and alkaline metallic salt and purification is readily carried out.
-
公开(公告)号：JPH025761B2
公开(公告)日：1990-02-05
申请号：JP24566583
申请日：1983-12-28
Applicant: DAICEL CHEM
Inventor： YAMASHITA MITSURU , SHIMA KOJI
IPC: C08B3/06
-
公开(公告)号：JPS63114632A
公开(公告)日：1988-05-19
申请号：JP26021886
申请日：1986-10-31
Applicant: DAICEL CHEM
Inventor： TAKAGI MOTOMI , SHIMA KOJI
Abstract: PURPOSE:To efficiently heat-treat polymeric film by a method wherein far infrared rays having the specified wavelengths, at which energy is absorbed by the polymeric film and molecular vibration is excited, are applied to the polymeric film for a comparatively short period of time. CONSTITUTION:Far infrared rays, the wavelengths of which are 4-400mum, preferably 4-100mum, are applied to a polymeric film for about 10-1,800sec in order to heat-treat the polymeric film at a temperature below its melting point. Since the molecular vibration of the polymeric film is excited, the film is extremely efficiently heat-treated by the internal heat. Normally, the energy density of a far infrared ray radiating element is 0.05-2.0W/cm and the distance between a matter to be irradiated and a radiator 1-100cm. Any irradiation time will do. Normally, the irradiation time is from 10sec-30min. The preferable irradiation time is form 10sec-10min.
-
公开(公告)号：JPS6162522A
公开(公告)日：1986-03-31
申请号：JP18395484
申请日：1984-09-03
Applicant: Daicel Chem Ind Ltd
Inventor： MIKUMO MASATOSHI , SHIMA KOJI
Abstract: PURPOSE: To obtain a polycondensation product having excellent quality and slight coloring, stably, by carrying out the polycondensation of bisphenol and diaryl carbonate, etc. in three steps while distilling out produced phenol from the system.
CONSTITUTION: The objective polycondensation product can be produced in three steps. In the first step, a bisphenol such as 2,2-bis(4'-hydroxyphenyl) propane and a diaryl carbonate and/or a dicarboxylic acid diaryl ester such as diphenyl terephthalate, etc. are subjected to the first-stage polycondensation reaction in the presence of a catalyst such as an alkali metal (carbonate) (e.g. Li), preferably at 50W300°C under 760W1mmHg pressure while distilling out 75W95wt% of the whole phenol to be distilled. In the second step, the product of the first step is extruded in the form of a strand of 1W5mmϕ into a vacuum chamber maintained at preferably 240W320°C and 10W0.1mmHg to remove a part of residual phenol by distillation, and in the third step, the phenol is completely distilled out by a twinscrew extruder.
COPYRIGHT: (C)1986,JPO&JapioAbstract translation: 目的：为了获得具有良好品质和轻微着色的缩聚产物，通过三步进行双酚和碳酸二芳基酯的缩聚反应，同时从体系中蒸馏出苯酚，稳定地进行。 构成：目标缩聚产物可以分三个步骤生产。 在第一步中，将2,2-双（4'-羟基苯基）丙烷和碳酸二芳酯等双酚和/或二苯基对苯二甲酸酯等二羧酸二芳基酯进行第一阶段缩聚反应 催化剂如碱金属（碳酸盐）（如Li）的存在，优选在60-300℃，760-1mmHg压力下，同时蒸出75-95wt％的待蒸馏的全部苯酚。 在第二步中，将第一步骤的产物以1-5mmφ的线材的形式挤出到保持在优选240-320℃和10-0.1mmHg的真空室中，以通过蒸馏除去一部分残余的苯酚 ，在第三步中，通过双螺杆挤出机将苯酚完全蒸馏掉。
-
公开(公告)号：JPH02139046A
公开(公告)日：1990-05-29
申请号：JP29194888
申请日：1988-11-18
Applicant: DAICEL CHEM
Inventor： SAEKI KAZUHIKO , UENO TAKASHI , SHIMA KOJI
Abstract: PURPOSE:To recover transition metal by a simple and efficient method by adding sulfur compounds to transition metal remaining in a reaction product obtained with a transition metal catalyst and recover the transition metal. CONSTITUTION:Transition metal remains in a reaction product obtained with a transition metal catalyst such as Fe or Co. Almost 100% of transition metal can be recovered by adding sulfur compounds such as H2S, Na2B and NaSS to the reaction product. Thus it is possible to recover efficiently the transition metal remaining in the reaction product by a simple method without using a specific device.
-
-
-
-
-
-
-
-
-
Search Results
31
records
(took 0.023 seconds)
