公开(公告)号：JPS55115840A

公开(公告)日：1980-09-06

申请号：JP2424979

申请日：1979-03-01

Applicant: TORAY INDUSTRIES

Inventor： KONDOU RIYOUZOU ,  YOKOYAMA TSUKASA ,  IKENO SHIGEO

IPC: C07C47/058 ,  C07C45/00 ,  C07C67/00

Abstract: PURPOSE:To bring a gas containing formaldehyde (K), stripped in a stripping step between dissolving and regeneration steps, into contact with a hydrous DMSO solution for recovering excess K used in the regeneration of cellulose. CONSTITUTION:Cellulose (C), a low-polymerization degree polyoxymethylene (F), and DMSO (D) are fed to the dissolving step A to give a formaldehyde adduct solution in D. The solution is then fed to the stripping step E, and heated with the carrier gas G to change excess F into the mixed gas Fg, which is fed to the gas- liquid contact step H. K in the mixed gas Fg is collected by the hydrous DMSO solution filled into the step H and external circulation system, and converted into F to give a slurry of F. F obtained by separation of the slurry or the slurry is directly fed to the step A.

公开(公告)号：JPS55115839A

公开(公告)日：1980-09-06

申请号：JP2425079

申请日：1979-03-01

Applicant: TORAY INDUSTRIES

Inventor： KONDOU RIYOUZOU ,  NOGI TATSUO ,  IKENO SHIGEO

IPC: C07C47/045 ,  C07C45/00 ,  C07C67/00

Abstract: PURPOSE:To recover formaldehyde (H) effectively, by heating H in stripping step between the dissolving and regeneration of cellulose under specific conditions. CONSTITUTION:A cellulose solution, obtained by heating cellulose, dimethyl sulfoxide, and excess low-polymerization degree polyoxymethylene (P), is heated at 115-135 deg.C, preferably 120-130 deg.C, for 0.5-5hr to strip and recover formaldehyde within the range below the amount of P and formaldehyde formed through decomposition of P of 0.2pts.wt. per unit weight of the cellulose.

公开(公告)号：JPS5574788A

公开(公告)日：1980-06-05

申请号：JP14783278

申请日：1978-12-01

Applicant: TORAY INDUSTRIES

Inventor： ARIYOSHI KATSUYUKI ,  IKENO SHIGEO

IPC: C12N1/12 ,  C12R1/89

Abstract: PURPOSE:To improve the yield of chlorella in the high-concentration continuous culturing of chlorella in the presence of light and oxygen, using acetic acid as a carbon source, by controlling the pH and the concentration of acetic acid in the culturing system disturbed by the metabolized acids produced in the system. CONSTITUTION:Chlorella (e.g. Chlorella bulgaris) is cultured continuously in a medium under the light irradiation of 1-10W/1 liter, and in the presence of air or O2, using acetic acid as a carbon source. The pH and the concentration of acetic acid are adjusted to 6.0-7.5 and

公开(公告)号：JPS5499173A

公开(公告)日：1979-08-04

申请号：JP518478

申请日：1978-01-23

Applicant: TORAY INDUSTRIES

Inventor： IKENO SHIGEO ,  KONDOU RIYOUZOU ,  IKEYAMA AKIO

IPC: C08J11/00 ,  C08J11/04

Abstract: PURPOSE:To regenerate only polyamide selectively from wastes containing the polyamide, by dissolving the wastes in hydrous ethylene glycol to remove undissolved substances, and by cooling the solution. CONSTITUTION:Wastes comprising polyamide or its mixture with other substances are dissolved in ethylene glycol containing 0.1-10 wt.% of water at 120 deg.C or above, preferably 190 deg.C or below, and the undissolved substances are removed by filtration and centrifugation. The solution is then cooled to deposit the polyamide, which is recovered. Polymer wastes discharged from textile manufacturing factories, fibrous wastes, woven fabrics, tire cords, carpet, and films may be used as the wastes. When the dissolving temperature is lower than 120 deg.C, the polyamide cannot be dissolved well to worsen the operating efficiency. Too high temperature is undesirable due to trouble to equipment.

公开(公告)号：JPS55100206A

公开(公告)日：1980-07-31

申请号：JP609879

申请日：1979-01-24

Applicant: TORAY INDUSTRIES

Inventor： OZASA SHIGEFUMI ,  KONDOU RIYOUZOU ,  IKENO SHIGEO

IPC: C01B25/234 ,  C01B25/18

Abstract: PURPOSE:To efficiently recover high purity orthophosphoric acid reusable as catalyst from phosphoric acid catalyst-contg. depolymerization residue by heat calcining the residue after which orthophosphoric acid is extracted with water and contacted to an h-type strongly acidic cation exchange resin. CONSTITUTION:Polycaprolactam or oligocaprolactam depolymerization residue is heat calcined. Water or an aq. sulfuric acid soln. is added to the resulting carbide and boiled to hydrolyze condensed phosphoric acid, and an aq. orthophosphoric acid soln. is extracted. The extracted soln. is then filtered to remove insol. carbide and contacted to an h-type strongly acidic ion exchange resin such as phenol sulfonic acid resin to remove alkali metals and other impurities bonded to the acid, thus recovering an aq. orthophosphoric acid soln. of high purity. By this method phosphoric acid catalyst for depolymerization can be used repeatedly.