| Patent Number |
Title Of Patent |
Date Issued |
| 6645409 |
Process for the production of cellulosic fibres |
November 11, 2003 |
| The invention relates to a process for the production of cellulosic fibers from solutions of cellulose in an aqueous tertiary amine oxide whereby the extruded fibers are led through a precipitating bath and cut and the cut fibers are passed through a series of water baths in the form of |
| 6579461 |
Method for preparing or purifying aqueous solutions of a tertiary amino-oxide |
June 17, 2003 |
| The invention relates to a process for the reprocessing respectively purification of aqueous solutions of a tertiary amine oxide, particularly of process waters, e.g. used precipitation baths, which occur during the production of cellulosic moulded bodies, comprising the separation of |
| 6113799 |
Process for selective separation of morpholine |
September 5, 2000 |
| The invention is concerned with a process for the selective separation of morpholine from an aqueous solution containing morpholine, N-methylmorpholine and N-methylmorpholine-N-oxide, characterized by the following steps:(A) passing said aqueous solution over a cation exchanger capable o |
| 5858285 |
Process for the production of an aqueous solution of a tertiary amine-oxide |
January 12, 1999 |
| The invention is concerned with a process for the production of an aqueous amine-oxide solution used in the amine-oxide process for the production of a mouldable cellulose solution, wherein aqueous, amine-oxide containing solutions produced in said amine-oxide process particularly as |
| 5795488 |
Process for transporting a solution of cellulose in an aqueous tertiary amine-oxide |
August 18, 1998 |
| The invention is concerned with a process for transporting a solution of cellulose in an aqueous tertiary amine-oxide through a component wherein said cellulose solution has different flow rates in said component, characterized in that an outlet wherethrough part of said cellulose so |
| 5773655 |
Process for the purification of an aqueous solution of a tertiary amine-oxide |
June 30, 1998 |
| The invention is concerned with a process for the purification of an aqueous solution of a tertiary amine-oxide containing impurities partially present in a dissolved and partially in a non-dissolved, colloidal state, and is characterized by a combination of the steps of(A) removing from |
| 5766530 |
Process for the production of cellulose moulded bodies |
June 16, 1998 |
| The invention is concerned with a process for the production of cellulose moulded bodies wherein a suspension of cellulose in an aqueous solution of a tertiary amine-oxide is transformed into a mouldable solution, said solution being extruded by means of a forming tool and conducted into |
| 5679146 |
Moulding materials and spinning materials containing cellulose |
October 21, 1997 |
| Moulding material and spinning material respectively containing cellulose, an aqueous tertiary amine-oxide, a non-solvent and a stabiliser, characterised in that, one or more stabilisers are provided which altogether have a basic and antioxidant action with the proviso that the basic |
| 5628941 |
Process for the production of cellulose moulded bodies |
May 13, 1997 |
| The invention is concerned with a process for the production of cellulose moulded bodies. In this process, cellulose is first dissolved in an aqueous solution of a tertiary amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO), to produce a mouldable cellulose solution. Second |
| 5556452 |
Moulding materials and spinning materials containing cellulose |
September 17, 1996 |
| Moulding material and spinning material respectively containing cellulose, an aqueous tertiary amine-oxide, a non-solvent and a stabiliser, characterised in that, one or more stabilisers are provided which altogether have a basic and antioxidant action with the proviso that the basic |
| 5503749 |
Process for the purification of aqueous solutions of amine-oxides |
April 2, 1996 |
| A process for the purification of aqueous solutions of amine-oxides, characterized in that said solutions are contacted with an aqueous purification solution of an alkali hydroxide and/or ion pair reagent by means of an anion active membrane. By means of the process according to the |
| 5486230 |
Stable moulding material and spinning material containing cellulose |
January 23, 1996 |
| A stable moulding material and spinning material containing cellulose, a tertiary amine-oxide, particularly N-methylmorpholine-N-oxide and optionally water, as well as a stabiliser, characterized in that as said stabiliser a mixture of glucosides of gallic acid and m-digallic acid is |
| 5189152 |
Cellulose solution in water and NMMO |
February 23, 1993 |
| A solution of cellulose in water and N-methylmorpholine-N-oxide (NMMO) containing 2 to 44% by weight cellulose is stabilized at 0.01 to 1%, preferably 0.1% H.sub.2 O.sub.2 and 0.01 to 2%, preferably 0.1% of an H.sub.2 O.sub.2 stabilizer, preferably oxalic acid or a salt thereof durin |
| 5178764 |
Process for cleaning or purifying aqueous N-methylmorpholine-N-oxide solutions |
January 12, 1993 |
| An aqueous N-methylmorpholine-N-oxide solution which was used as a spinning bath in the production of cellulosic products is regenerated by contacting it with active coal, silicon dioxide or alumina adsorbent and filtering, thereby reducing turbidity, eliminating nitrosoamine, decolorizi |
| 5053138 |
Process for purifying an aqueous solution of N-methyl-morpholine N-oxide |
October 1, 1991 |
| There is disclosed a process for purifying aqueous solutions of N-methyl-morpholine N-oxide (NMMO), such as spinning bath solutions incurred in the production of cellulose products, in which process the solutions to be purified are contacted with an anion exchanger and the purified s |
