GB747108A - Improvements in and relating to the production of wood pulp - Google Patents
Improvements in and relating to the production of wood pulpInfo
- Publication number
- GB747108A GB747108A GB2692053A GB2692053A GB747108A GB 747108 A GB747108 A GB 747108A GB 2692053 A GB2692053 A GB 2692053A GB 2692053 A GB2692053 A GB 2692053A GB 747108 A GB747108 A GB 747108A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquor
- cooking
- wood
- electrical conductance
- given
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/228—Automation of the pulping processes
Landscapes
- Paper (AREA)
Abstract
<PICT:0747108/IV(a)/1> <PICT:0747108/IV(a)/2> Wood pulp of reproducible quality is obtained by cooking wood chips with aqueous bisulphite solution containing excess sulphur dioxide whilst measuring the electrical conductance of the liquor, observing the time when minimum conductance is reached and continuing the cooling for a certain period after such time, as determined by a previous trial run. The process is based on the observation that, notwithstanding normal variations in the composition of the initial liquor, in liquor/wood ratio and in maximum pressure, the quality of the pulp depends on the period for which cooking is continued beyond the point when minimum electrical conductance of the liquor is passed, this being constant for any given wood and given cooking temperature. Fig. 3 is a flow diagram of a suitable apparatus, comprising a digester 1 and continuously operating pump 2. In a by-pass line 3 the liquor flows through a glass tube wherein its electrical conductance is measured. Fig. 4 shows a suitable measuring apparatus, wherein the liquor flows through a capillary glass tube 4 having two gold-plated pieces of copper 5, 6 wrapped round the tube, acting as electrodes. Electrode 5 is connected through condenser 8 to a source 7 of radio-frequency oscillations and the current passing through to electrode 6 is rectified and measured by an automatically recording microammeter 9. The slide 10 and shunt 11 are used to apply bias to the microammeter to vary the scale readings. Examples are given illustrating the constancy of physical characteristics of pulps produced under varying conditions of liquor composition, liquor/wood ratio and maximum pressure when the same temperature cycle is followed and cooking is continued for the same period after the point of minimum electrical conductance of the cooking liquor is reached. The liquors used were magnesium bisulphite solution and calcium bisulphite solution; each containing excess sulphur dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2692053A GB747108A (en) | 1953-10-01 | 1953-10-01 | Improvements in and relating to the production of wood pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2692053A GB747108A (en) | 1953-10-01 | 1953-10-01 | Improvements in and relating to the production of wood pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB747108A true GB747108A (en) | 1956-03-28 |
Family
ID=10251285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2692053A Expired GB747108A (en) | 1953-10-01 | 1953-10-01 | Improvements in and relating to the production of wood pulp |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB747108A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086129A (en) * | 1975-11-03 | 1978-04-25 | International Telephone And Telegraph Corporation | Process for controlling the intrinsic viscosity of sulfite pulp |
| WO1997013916A2 (en) * | 1995-10-09 | 1997-04-17 | Siemens Aktiengesellschaft | Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
-
1953
- 1953-10-01 GB GB2692053A patent/GB747108A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086129A (en) * | 1975-11-03 | 1978-04-25 | International Telephone And Telegraph Corporation | Process for controlling the intrinsic viscosity of sulfite pulp |
| WO1997013916A2 (en) * | 1995-10-09 | 1997-04-17 | Siemens Aktiengesellschaft | Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
| WO1997013916A3 (en) * | 1995-10-09 | 1997-07-17 | Siemens Ag | Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
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