FR2248070A2 - Cellulose acetate fibrous filtering material - produced by turbulent mixing of solution esp. with water then shearing action - Google Patents

Cellulose acetate fibrous filtering material - produced by turbulent mixing of solution esp. with water then shearing action

Info

Publication number
FR2248070A2
FR2248070A2 FR7430751A FR7430751A FR2248070A2 FR 2248070 A2 FR2248070 A2 FR 2248070A2 FR 7430751 A FR7430751 A FR 7430751A FR 7430751 A FR7430751 A FR 7430751A FR 2248070 A2 FR2248070 A2 FR 2248070A2
Authority
FR
France
Prior art keywords
cellulose acetate
pptn
agent
solution
filtering material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7430751A
Other languages
French (fr)
Other versions
FR2248070B2 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
E&J Gallo Winery
Original Assignee
E&J Gallo Winery
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US00332640A external-priority patent/US3842007A/en
Priority claimed from US05/408,296 external-priority patent/US3961007A/en
Application filed by E&J Gallo Winery filed Critical E&J Gallo Winery
Publication of FR2248070A2 publication Critical patent/FR2248070A2/en
Application granted granted Critical
Publication of FR2248070B2 publication Critical patent/FR2248070B2/fr
Granted legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
    • D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/40—Formation of filaments, threads, or the like by applying a shearing force to a dispersion or solution of filament formable polymers, e.g. by stirring

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)

Abstract

Continuous prodn. of fibrous cellulose acetate, possessing a fibrous structure and filtration properties comparable to those of asbestos, is as follows: (a) a 2-4 wt. % solution, in an organic solvent of medium polarity, of a cellulose acetate having a viscosity of 25-45 seconds according to ASTM D 1,343-69, and a pptn. agent for cellulose acetate are turbulently mixed together in a ratio by volume (pptn. agent: cellulose acetate solution) of 4:1 - 20:1; (b) the resultant slurry is continuously drawn from the pptn. zone and subjected to a shearing action which produces a surface of 35-55 m2/g having a feathery fibrous form; (c) the ppte. is then washed with a non-dissolving liquid. The turbulent mixing is pref. produced by the particular speeds and directions of the solution and pptn. agent, in particular these two constituents are led in from opposite ends of the upper branch of a T-shaped vessel, the mixt. being drawn off down the 'stroke' of the T. Pref. organic solvent is acetone, and both the pptg. agent and also the washing liquid may be water. The temp. of the pptn. agent is ambient-80 (40-50) degrees C and the volumetric ratio is 12:1-18:1 (15:1). The cellulose acetate solution may contain an insoluble filtering material, esp. cellulose fibres, diatomaceous earth, or a mixture of these, in a ratio by weight (cellulose acetate; insoluble filtering material) of 0.5:1-3:1 (1:1).
FR7430751A 1973-02-15 1974-09-11 Cellulose acetate fibrous filtering material - produced by turbulent mixing of solution esp. with water then shearing action Granted FR2248070A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US00332640A US3842007A (en) 1973-02-15 1973-02-15 Fibrous cellulose acetate filter material
US05/408,296 US3961007A (en) 1973-10-23 1973-10-23 Continuous process for making fibrous cellulose acetate filter material

Publications (2)

Publication Number Publication Date
FR2248070A2 true FR2248070A2 (en) 1975-05-16
FR2248070B2 FR2248070B2 (en) 1978-07-07

Family

ID=26988306

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7430751A Granted FR2248070A2 (en) 1973-02-15 1974-09-11 Cellulose acetate fibrous filtering material - produced by turbulent mixing of solution esp. with water then shearing action

Country Status (1)

Country Link
FR (1) FR2248070A2 (en)

Also Published As

Publication number Publication date
FR2248070B2 (en) 1978-07-07

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