GB802522A - Improvements in or relating to recovery of citric acid - Google Patents
Improvements in or relating to recovery of citric acidInfo
- Publication number
- GB802522A GB802522A GB21002/55A GB2100255A GB802522A GB 802522 A GB802522 A GB 802522A GB 21002/55 A GB21002/55 A GB 21002/55A GB 2100255 A GB2100255 A GB 2100255A GB 802522 A GB802522 A GB 802522A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium
- citrate
- acid
- citric acid
- mol
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
- C07C59/235—Saturated compounds containing more than one carboxyl group
- C07C59/245—Saturated compounds containing more than one carboxyl group containing hydroxy or O-metal groups
- C07C59/265—Citric acid
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/41—Preparation of salts of carboxylic acids
- C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Calcium mono-acid citrate is precipitated from an aqueous solution of citric acid by heating the solution at a temperature of at least 40 DEG C. either in the presence of calcium hydroxide, calcium oxide or calcium carbonate, wherein the amount of calcium present in the reaction mixture is not greater than two-thirds of that theoretically required for the complete neutralization of the citric acid to form tricalcium citrate, or in the presence of tricalcium citrate in an amount not exceeding one mol. per mol. of free citric acid present. Citric acid may be regenerated from the calcium mono-acid citrate, e.g. by treating the latter with a stoichiometric amount of sulphuric acid. It is preferred to use reaction temperatures of above 70 DEG C., e.g. temperatures of 80 DEG to 95 DEG C. and improved results are obtained if the mixture to be converted to calcium mono-acid citrate is seeded with calcium mono-acid citrate. The amount of calcium added in the form of calcium monoacid citrate for seeding is not to be considered in calculating the maximum amount of calcium which may be present in the reaction mixture to form the calcium mono-acid citrate. In one method of operation a citric acid solution is divided into two parts, the first part, about two-thirds of the total, may be completely neutralized with calcium hydroxide, calcium oxide, or calcium carbonate, and the tricalcium citrate which precipitates may be filtered off and added to the remaining part of the original citric acid solution and the mixture heated to at least 40 DEG C. to precipitate calcium mono-acid citrate. In examples, calcium acid citrate is precipitated by (1) adding tricalcium citrate (1 mol.) to a solution of citric acid (1 mol.) in two litres of water and heating the mixture at 40 DEG C. for 23 hours; (2) adding calcium hydroxide (1 mol) (or the equivalent amounts of calcium oxide or calcium carbonate) to a solution of one mol. citric acid in 1 litre of water and heating at 90 DEG C. for 2 hours; (3) adding 0.6 mol. of calcium hydroxide to citric acid (1 mol.) dissolved in 1 litre of water and heating the mixture at 40 DEG C. for 2 1/2 hours. In other examples: (4) and (5) about 5 per cent of the calcium hydroxide required to produce complete neutrality is added to a fermentation liquor in which citric acid has been prepared and the resulting precipitate of oxalic acid is filtered off and calcium mono-acid citrate is precipitated by adding tricalcium citrate to the filtrate while maintaining the mixture at 90 DEG C. in (4) (or 85-90 DEG C. in (5)) and adding some calcium mono-acid citrate as seed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US802522XA | 1954-07-28 | 1954-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB802522A true GB802522A (en) | 1958-10-08 |
Family
ID=22156186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21002/55A Expired GB802522A (en) | 1954-07-28 | 1955-07-20 | Improvements in or relating to recovery of citric acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB802522A (en) |
-
1955
- 1955-07-20 GB GB21002/55A patent/GB802522A/en not_active Expired
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