Title:
PRODUCTION OF CELLULOSE ETHER LOW IN DEGREE OF POLYMERIZATION
Document Type and Number:
Japanese Patent JP3522002
Kind Code:
B2
Abstract:
PURPOSE: To produce a cellulose ether low in degree of polymn. with a good accuracy of desired viscosity and degree of polymn.
CONSTITUTION: The degree of polymn. after treatment of a cellulose ether as the starting material is calculated according to the following formula: degree of polymn. after treatment = degree of polymn. before treatment/(S+1) wherein S=(-0.000775α+1.07044).β.(0.3179+8.611023H)×1013.(-0.10714W+1.1624).exp(-E/RT).θ [wherein α is the average particle size (μm) of the starting material; βis a constant of 0.7 to 1.0 (μm-1.hr-1) inherent in the kind of starting material; H is the proportion (wt.%) of hydrogen chloride to the starting material in a reactor; W is the proportion (wt.%) of water to the total of the starting material and water in the reactor; E is an activation energy of 20,370cal/mol; R is a gas constant of 1.986cal/(mol.K); T is the temp. (K) in the reactor; and θis the treatment time (hr)]. A reaction is terminated at a predetermined degree of polymn. after treatment.
Inventors:
Tanaka, Takashi
Tamura, Yukio
Tamura, Yukio
Application Number:
JP11461995A
Publication Date:
April 26, 2004
Filing Date:
May 12, 1995
Export Citation:
Assignee:
SHIN ETSU CHEM CO LTD
International Classes:
C08B11/02; C08B11/193; C08B11/20; (IPC1-7): C08B11/20; C08B11/02
Attorney, Agent or Firm:
小宮 良雄