GB448938A - Improvements in or relating to the treatment of cellulose nitrate - Google Patents

Improvements in or relating to the treatment of cellulose nitrate

Info

Publication number
GB448938A
GB448938A GB36164/34A GB3616434A GB448938A GB 448938 A GB448938 A GB 448938A GB 36164/34 A GB36164/34 A GB 36164/34A GB 3616434 A GB3616434 A GB 3616434A GB 448938 A GB448938 A GB 448938A
Authority
GB
United Kingdom
Prior art keywords
decanted
water
cellulose nitrate
nitrate
acid
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.)
Expired
Application number
GB36164/34A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB448938A publication Critical patent/GB448938A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B5/00—Preparation of cellulose esters of inorganic acids, e.g. phosphates
    • C08B5/02—Cellulose nitrate, i.e. nitrocellulose

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

Cellulose nitrate is suspended, after the usual stabilization or purification, in an aqueous liquid having a pH value lying between about 3,5 and 6,5, preferably between 3,5 and 4,0, whereby the fines become separated from the relatively long fibres, the long fibred cellulose nitrate is allowed to settle, and the aqueous liquid containing fines in suspension is decanted. Water may then be added, the long fibred cellulose nitrate is again allowed to settle, and the water containing the fines is decanted. These steps are repeated until the decanted water is substantially free from milkiness. The supernatant liquid is conveniently drawn off by means of a pipe, or a rotating bailer washer is used, fresh water being continuously introduced preferably near the bottom of the washing tub. In an example, cellulose nitrate of 11 per cent nitrogen content is boiled in acid of about 0,5 per cent strength. The acid is drained and the nitrate given two washes with bottom drainage. It is then agitated with water, which will have a pH value of about 3,5 to 4,0 due to diffusion of acid from the nitrate, allowed to stand for 2 or 3 minutes, and the milky liquor decanted off. The washing and decanting are repeated until the decanted liquors are clear. In a second example, a hexagonal rotating bailer washer is used, and the flow of wash liquor is continuous.
GB36164/34A 1933-12-16 1934-12-17 Improvements in or relating to the treatment of cellulose nitrate Expired GB448938A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US448938XA 1933-12-16 1933-12-16

Publications (1)

Publication Number Publication Date
GB448938A true GB448938A (en) 1936-06-17

Family

ID=21934906

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36164/34A Expired GB448938A (en) 1933-12-16 1934-12-17 Improvements in or relating to the treatment of cellulose nitrate

Country Status (1)

Country Link
GB (1) GB448938A (en)

Similar Documents

Publication Publication Date Title
GB318868A (en) Improvements in or relating to the treatment of cellulose
US2006700A (en) Process for the production of vitamin free casein
GB448938A (en) Improvements in or relating to the treatment of cellulose nitrate
GB356277A (en) Improved manufacture of paper
US2301314A (en) Process of making alpha cellulose
US1831740A (en) Production of fibers from cocoanuts
US1410226A (en) Method of preserving ferns
US3077372A (en) Sodium hydroxide and chlorine for in situ hypochlorite formation in pretreatment of cotton in peroxidic bleaching
US2186487A (en) Bleaching pulp
US1935580A (en) Processing of cellulose fiber
US1828338A (en) Fiber bleaching
US2190594A (en) Refining of animal and vegetable oils
SU60591A1 (en) Method for increasing wetting ability of mercerization liquors
GB274940A (en) Improvements in and relating to the treatment of cellulosic materials
DE539401C (en) Process for the production of high quality cellulose for further processing on cellulose esters, rayon etc. Like. Made of wood pulp
GB634440A (en) Process for the flocculation of solids in aqueous suspensions
GB209200A (en) Process for the treatment of jute
SU510436A1 (en) Calcium Carbonate Production Method
GB1091124A (en) Process of bleaching paper pulp
SU90392A1 (en) The method of refining black cottonseed oil
GB395722A (en) Improvements in and relating to the treatment of fibres or fabrics consisting of or containing cellulose acetate
GB244324A (en) Process and means for washing artificial fibres wound upon bobbins
AT148150B (en) Process for the preparation of a very pure cellulose.
GB435642A (en) Improvements in and relating to the treatment of fibrous materials
GB361509A (en) Process for the recovery of sulphuric acid