| Patent Number |
Title Of Patent |
Date Issued |
| 7097738 |
Process for producing pulp |
August 29, 2006 |
| The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural. The method is applicable to herbaceous plants, in particular. |
| 6955743 |
Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor |
October 18, 2005 |
| The invention relates to a process for recovering and producing chemicals in a pulp production process where organic chemicals, such as formic acid and acetic acid, are used as cooking chemicals. The process of the invention is based on regeneration of cooking acids and formation of |
| 6923888 |
Process for recovering organic acids from bleaching liquors |
August 2, 2005 |
| The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid, such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtained from the bleaching o |
| 6562191 |
Process for producing pulp with a mixture of formic acid and acetic acid as cooking chemical |
May 13, 2003 |
| A process based on formic acid cooking for producing pulp from herbaceous plants and deciduous trees by using acetic acid as an additional cooking chemical. The obtained pulp can be used in fine paper and board production as short-fibered material, for instance. The invention also relate |
| 6156156 |
Method of producing pulp using single-stage cooking with formic acid and washing with performic |
December 5, 2000 |
| The invention relates to a method of producing pulp with a high brightness using single-stage cooking with formic acid, washing with performic acid and bleaching with oxidizing bleaching chemicals. In performic acid washing, the rapid formation and rapid reactions of performic acid ( |
