GB816281A - Coagulation of lignin in aqueous suspension - Google Patents
Coagulation of lignin in aqueous suspensionInfo
- Publication number
- GB816281A GB816281A GB3359857A GB3359857A GB816281A GB 816281 A GB816281 A GB 816281A GB 3359857 A GB3359857 A GB 3359857A GB 3359857 A GB3359857 A GB 3359857A GB 816281 A GB816281 A GB 816281A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lignin
- slurry
- solution
- produce
- salt
- 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
- 229920005610 lignin Polymers 0.000 title abstract 20
- 239000007900 aqueous suspension Substances 0.000 title abstract 3
- 230000015271 coagulation Effects 0.000 title abstract 3
- 238000005345 coagulation Methods 0.000 title abstract 3
- 239000002002 slurry Substances 0.000 abstract 16
- 239000000243 solution Substances 0.000 abstract 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 12
- 239000002245 particle Substances 0.000 abstract 6
- 150000003839 salts Chemical class 0.000 abstract 6
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 abstract 6
- 239000011734 sodium Substances 0.000 abstract 6
- 229910052708 sodium Inorganic materials 0.000 abstract 6
- 239000011780 sodium chloride Substances 0.000 abstract 6
- 238000007710 freezing Methods 0.000 abstract 5
- 238000001914 filtration Methods 0.000 abstract 4
- 238000000034 method Methods 0.000 abstract 4
- 239000007787 solid Substances 0.000 abstract 4
- 238000010257 thawing Methods 0.000 abstract 3
- 229940052299 Calcium Chloride Dihydrate Drugs 0.000 abstract 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 abstract 2
- 241000218631 Coniferophyta Species 0.000 abstract 2
- 239000003513 alkali Substances 0.000 abstract 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L cacl2 Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract 2
- 159000000007 calcium salts Chemical class 0.000 abstract 2
- 230000001112 coagulant Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 2
- 239000007858 starting material Substances 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 2
- 239000000725 suspension Substances 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000003186 pharmaceutical solution Substances 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
- C02F11/20—Treatment of sludge; Devices therefor by thermal conditioning by freezing
Abstract
A method of coagulating colloidal aqueous suspensions of lignin particles in insoluble form consists in freezing a quantity of such a suspension to a completely solid state to effect coagulation of the lignin particles, and thawing the solid to produce a slurry containing readily-filterable lignin particles. Examples: (1) A quantity of purified sodium lignin salt obtained by the sulphate process from conifers was dissolved and the solution acidified (pH 1 to 2) to produce a lignin slurry. The slurry was cooled to - 20 DEG C., was maintained at this temperature for 20 hours, and thereafter thawed. The filtration time was considerably reduced. (2) The starting material was a lignin obtained by the soda process; this was dissolved in dilute sodium hydroxide solution and the solution acidified to produce a slurry which was then treated as in (1) above. (3) The sodium lignin salt of Example (1) above was converted to a slurry of the calcium salt by solution in sodium hydroxide solution and treatment with a solution of calcium chloride dihydrate. This slurry was treated as before. (4) A quantity of the sodium lignin salt of Example (1), in an oxidized state, was dissolved in alkali and the resulting solution acidified to produce the slurry. The slurry was frozen overnight at - 20 DEG C., thawed and filtered.ALSO:A method of coagulating colloidal aqueous suspensions of lignin particles in insoluble form consists of freezing a quantity of such a suspension to a completely solid state to effect coagulation of the lignin particles, and thawing the solid to produce a slurry containing readily-filterable lignin particles. Examples: (1) A quantity of purified sodium lignin salt obtained by the sulphate process from conifers was dissolved and the solution acidified (pH 1 to 2) to produce a lignin slurry. The slurry was cooled to -20 DEG C., was maintained at this temperature for 20 hours, and thereafter thawed. The filtration time was considerably reduced. (2) The starting material was a lignin obtained by the soda process; this was dissolved in dilute sodium hydroxide solution and the solution acidified to produce a slurry which was then treated as in (1) above. (3) The sodium lignin salt of example (1) above was converted to a slurry of the calcium salt by solution in sodium hydroxide solution and treatment with a solution of calcium chloride dihydrate. This slurry was treated as before. (4) A quantity of the sodium lignin salt of example (1), in an oxidised state, was dissolved in alkali and the resulting solution acidified to produce the slurry. The slurry was frozen overnight at -20 DEG C., thawed and filtered. Freezing after heating and freezing after filtering are ineffective. Heat-sensitive pharmaceutical solutions may be clarified by dissolving lignin therein, acidifying the lignin solution, freezing and thawing, and filtering off the coagulated lignin along with any entrained or adsorbed material associated therewith.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB816281A true GB816281A (en) | 1959-07-08 |
Family
ID=1743529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3359857A Expired GB816281A (en) | 1957-10-28 | Coagulation of lignin in aqueous suspension |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB816281A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10253057B2 (en) | 2014-11-12 | 2019-04-09 | Renmatix, Inc. | Method of coalescing a substance |
-
1957
- 1957-10-28 GB GB3359857A patent/GB816281A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10253057B2 (en) | 2014-11-12 | 2019-04-09 | Renmatix, Inc. | Method of coalescing a substance |
| US10633405B2 (en) | 2014-11-12 | 2020-04-28 | Renmatix, Inc. | Method of coalescing a substance |
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