公开(公告)号：MY120444A

公开(公告)日：2005-10-31

申请号：MYPI9800379

申请日：1998-01-27

Applicant: TORAY INDUSTRIES

Inventor： OGAWA DAISUKE ,  KOIKE MASAHIRO ,  YAMAMOTO YOSHIYUKI

IPC: C07D317/12

Abstract: CYCLIC FORMAL IS MANUFACTURED BY CYCLIC REACTION OF AN ALKYLENE GLYCOL AND AN ALDEHYDE IN A REACTOR, PRODUCING FORMAL MIXED WITH UNREACTED ALDEHYDE AS AN IMPURITY, WHICH IS REDUCED IN AMOUNT BY CONNECTING THE REACTOR TO A DISTILLATION TOWER AND CONTINUOUSLY SUPPLYING A RAW ALKYLENE GLYCOL TO THE DISTILLATION TOWER FROM WHICH UNREACTED FORMALDEHYDE AND A CYCLIC FORMAL ARE BEING DISTILLED, AND CONTINUOUSLY REACTING THEM WITH SUPPLIED RAW FORMALDEHYDE BY COUNTERCURRENT FLOW DURING DISTILLATION. WATER CONTENT IS AZEOTROPIC ADMIXTURE WITH CYCLIC FORMAL CAN BE REMOVED BY AZEOTROPIC DISTILLATION WITH A HYDROCARBON AZEOTROPIC ADMIXTURE WITH WATER, DISTILLING WATER FROM THE CYCLIC FORMAL.

公开(公告)号：DE69807135D1

公开(公告)日：2002-09-19

申请号：DE69807135

申请日：1998-01-29

Applicant: TORAY INDUSTRIES

Inventor： OGAWA DAISUKE ,  KOIKE MASAHIRO ,  YAMAMOTO YOSHIYUKI

IPC: C07D317/12

Abstract: Cyclic formal is manufactured by cyclic reaction of an alkylene glycol and an aldehyde in a reactor, producing formal mixed with unreacted aldehyde as an impurity, which is reduced in amount by connecting the reactor to a distillation tower and continuously supplying a raw alkylene glycol to the distillation tower from which unreacted formaldehyde and a cyclic formal are being distilled, and continuously reacting them with supplied raw formaldehyde by countercurrent flow during distillation. Water content in azeotropic admixture with cyclic formal can be removed by azeotropic distillation with a hydrocarbon azeotropic admixture with water, distilling water from the cyclic formal.

公开(公告)号：DE69807135T2

公开(公告)日：2003-03-27

申请号：DE69807135

申请日：1998-01-29

Applicant: TORAY INDUSTRIES

Inventor： OGAWA DAISUKE ,  KOIKE MASAHIRO ,  YAMAMOTO YOSHIYUKI

IPC: C07D317/12

Abstract: Cyclic formal is manufactured by cyclic reaction of an alkylene glycol and an aldehyde in a reactor, producing formal mixed with unreacted aldehyde as an impurity, which is reduced in amount by connecting the reactor to a distillation tower and continuously supplying a raw alkylene glycol to the distillation tower from which unreacted formaldehyde and a cyclic formal are being distilled, and continuously reacting them with supplied raw formaldehyde by countercurrent flow during distillation. Water content in azeotropic admixture with cyclic formal can be removed by azeotropic distillation with a hydrocarbon azeotropic admixture with water, distilling water from the cyclic formal.

公开(公告)号：SG65045A1

公开(公告)日：1999-05-25

申请号：SG1998000152

申请日：1998-01-21

Applicant: TORAY INDUSTRIES

Inventor： OGAWA DAISUKE ,  KOIKE MASAHIRO ,  YAMAMOTO YOSHIYUKI

IPC: C07D317/12

Abstract: Cyclic formal is manufactured by cyclic reaction of an alkylene glycol and an aldehyde in a reactor, producing formal mixed with unreacted aldehyde as an impurity, which is reduced in amount by connecting the reactor to a distillation tower and continuously supplying a raw alkylene glycol to the distillation tower from which unreacted formaldehyde and a cyclic formal are being distilled, and continuously reacting them with supplied raw formaldehyde by countercurrent flow during distillation. Water content in azeotropic admixture with cyclic formal can be removed by azeotropic distillation with a hydrocarbon azeotropic admixture with water, distilling water from the cyclic formal.

公开(公告)号：ID19754A

公开(公告)日：1998-07-30

申请号：ID980124

申请日：1998-01-28

Applicant: TORAY INDUSTRIES

Inventor： OGAWA DAISUKE ,  KOIKE MASAHIRO ,  YAMAMOTO YOSHIYUKI

IPC: C07D317/12 ,  C07B63/00

Abstract: Cyclic formal is manufactured by cyclic reaction of an alkylene glycol and an aldehyde in a reactor, producing formal mixed with unreacted aldehyde as an impurity, which is reduced in amount by connecting the reactor to a distillation tower and continuously supplying a raw alkylene glycol to the distillation tower from which unreacted formaldehyde and a cyclic formal are being distilled, and continuously reacting them with supplied raw formaldehyde by countercurrent flow during distillation. Water content in azeotropic admixture with cyclic formal can be removed by azeotropic distillation with a hydrocarbon azeotropic admixture with water, distilling water from the cyclic formal.

公开(公告)号：JPH1077280A

公开(公告)日：1998-03-24

申请号：JP23347896

申请日：1996-09-03

Applicant: TORAY INDUSTRIES

Inventor： KITAGAWA TETSUJI ,  YOSHIKAWA MASATO ,  KOIKE MASAHIRO

IPC: C07D323/06 ,  B01J31/10 ,  C07B61/00

Abstract: PROBLEM TO BE SOLVED: To enable the production of trioxane from an formaldehyde aqueous solution by using a solid acid catalyst with inhibition of the corrosion of the reactor and the formation of formaldehyde polymer. SOLUTION: Trioxane is produced by bringing an aqueous solution of formaldehyde into contact with a solid acid catalyst, for example, a cationic ion exchange resin bearing sulfonic acid groups. In the production of trioxane by repeatedly bringing the aqueous solution into contact with the solid acid catalyst, it is important to lower the acidic free substance in the formaldehyde aqueous solution less than 10,000ppm, preferably 1,000ppm. For example, a part of the aqueous formaldehyde solution containing acidic free substance is taken out of the reaction system and another formaldehyde aqueous solution of a lower content of the free substance is introduced to control the concentration of the acidic free substance. Trioxane is useful as a feedstock for polyoxymethylene copolymer, an engineering plastic.

公开(公告)号：JPS62280588A

公开(公告)日：1987-12-05

申请号：JP12429686

申请日：1986-05-29

Applicant: TORAY INDUSTRIES ,  NICHIAS CORP

Inventor： ASAHARA NOBUO ,  KUSUMOTO NOBUHIRO ,  KOIKE MASAHIRO ,  KOSHIKAWA YUTAKA

IPC: F28F19/04

Abstract: PURPOSE:To prevent corrosion of the inner side of a pipe, by a method wherein a film formed by fluorine plastic is formed to the inner side of a metallic pipe. CONSTITUTION:Fluorine plastic sealing of a metallic pipe 5 and tubeplate 3 and 4 can be effected by using a reinforcing plate 12 formed by fluorine plastic. Namely, flare is formed to a film 10 of fluorine plastic formed on the metallic pipe 5 side, and the flare, a film 11 of fluorine plastic formed to the tubeplate 3, and the reinforcing plate 12 made of fluorine plastic are welded at a stroke for joining. Corrosive fluid or adherent fluid incoming through an opening 6 is forced to flow through the metallic pipe 5 after flowing through a space (a), and is drained through an opening 8 by means of a space (C). Since a film is formed to the inner side of the metallic pipe 5 and the tubeplate using fluorine plastic, corrosion of the inner side of the metallic pipe and choking of the pipe are prevented from occurring.

公开(公告)号：JPH10114770A

公开(公告)日：1998-05-06

申请号：JP26641596

申请日：1996-10-07

Applicant: TORAY INDUSTRIES

Inventor： KITAGAWA TETSUJI ,  YOSHIKAWA MASATO ,  KOIKE MASAHIRO

IPC: C07D323/06 ,  B01J31/06

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing trioxane useful as a raw material for producing a polyoxymethylene copolymer, in a high initial rate of production and without forming a byproduct by using a specific solid acid catalyst having a high mechanical strength. SOLUTION: This method for producing trioxane is to make a contact of (A) formaldehyde with (B) a solid acid catalyst of a polyorganosiloxane having a sulfonic acid group (preferably contains 0.01-10mmol/g amount of sulfonic acid) and containing a skeleton expressed by the formula (R is a functional group containing sulfonic group) e.g. at 70-150 deg.C. Further, since the component B is a solid, the reaction is carried out by using a flow type, and in such case the reaction is performed by using 1-1000g feeding amount of the aqueous solution of the component A based on 1g component B.

公开(公告)号：JPH11106382A

公开(公告)日：1999-04-20

申请号：JP1616598

申请日：1998-01-28

Applicant: TORAY INDUSTRIES

Inventor： OGAWA DAISUKE ,  KOIKE MASAHIRO ,  YAMAMOTO YOSHIYUKI

IPC: C07D317/12 ,  C07B61/00 ,  C07D319/06 ,  C07D321/06 ,  C07D323/00

Abstract: PROBLEM TO BE SOLVED: To provide a method for continuously producing a purified cyclic formal by which the cyclic formal hardly containing impurities, especially the cyclic formal hardly containing formaldehyde and water is continuously produced in a constituent process from a synthetic step for the cyclic formal through a purifying step thereof and the rectification efficiency is remarkably improved. SOLUTION: When an alkylene glycol is reacted with formaldehyde in the presence of a catalyst by using a reactive distillation column having a reactor 1 and a distillation column 2 to produce a cyclic formal, the alkylene glycol is continuously fed from the distillation column 2 of the reactive distillation column to the reactor 1 and the formaldehyde is continuously fed to the reactor 1 of the reactive distillation column to react both the components. At this time, the alkylene glycol fed to the distillation column 2 is introduced into the reactor 1 while bringing the alkylene glycol into countercurrent contact with the unreacted formaldehyde from the reactor 1 and absorbing or reacting the alkylene glycol with the formaldehyde. Thereby, the alkylene glycol is reacted with the formaldehyde.

公开(公告)号：JPH1072461A

公开(公告)日：1998-03-17

申请号：JP22698396

申请日：1996-08-28

Applicant: TORAY INDUSTRIES

Inventor： KITAGAWA TETSUJI ,  YOSHIKAWA MASATO ,  KOIKE MASAHIRO

IPC: C07D323/06 ,  B01J31/10 ,  C07B61/00

Abstract: PROBLEM TO BE SOLVED: To enable to stably produce trioxane useful as a raw material for producing polyoxymethylene (co)polymers in a state inhibiting the initial deterioration in the activity of a trioxane synthesis catalyst by using a specific cation exchange material as the trioxane synthesis catalyst. SOLUTION: This method for producing trioxane comprises bringing (B) formaldehyde (e,g. an aqueous solution containing the formaldehyde in a concentration of 30-75wt.%) into contact with (A) a cation exchange material preliminarily treated with an aqueous solution containing formaldehyde or trioxane (e.g. in a concentration of 35-75wt.%) (preferably the cation exchange material whose acidic groups are lost in an amount of approximately 1-30mol.% based on the initially held acidic groups) preferably at a temperature of 70-150 deg.C. The method enables to prevent the clouding of the aqueous formaldehyde solution in the reaction system, prevent the lowering in the production yield of the trioxane, and inhibit the corrosion of installations.