GB649516A - Process of manufacturing synthetic tannin from aromatic sulphonic acids - Google Patents
Process of manufacturing synthetic tannin from aromatic sulphonic acidsInfo
- Publication number
- GB649516A GB649516A GB873747A GB873747A GB649516A GB 649516 A GB649516 A GB 649516A GB 873747 A GB873747 A GB 873747A GB 873747 A GB873747 A GB 873747A GB 649516 A GB649516 A GB 649516A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- novolak
- prepared
- sulphonic
- formic
- 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
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
- C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
- C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
A synthetic tanning agent is made by condensing a sulphonic acid of a novolak prepared from phenol, cresols, their homologues, or naphthols with a compound which contains in the molecule an active methylol group and an amino group and which is made by reacting urea and/or thiourea and ammonia together with an aldehyde in acid solution. In an example, a compound which has the probable formula OH-CH2-NH-CO-NH-CH2-NH-CO-NH-CH2 -NH2+ 1/2 H2SO4 is prepared by mixing formaldehyde solution, aqueous ammonia and sulphuric acid, heating to 70 DEG C., adding urea solution gradually and continuing heating. The product is then reacted in the presence of formic acid with a product obtained by sulphonation of a novolak prepared by reacting, in acid medium, phenol and formaldehyde in the approximate molar ratio of 2 : 1. More formic acid is added. As a modification, phenols, phenolic resins, lignin sulphonic acids or other sulphonic acids may be admixed with the novolak sulphonic acid starting material. The products may be used in the free state, buffered, or as their ammonium, sodium, chromium or aluminium salts, to which formic or oxalic acid may be added. Specification 644,451 is referred to.ALSO:A synthetic tanning agent is made by condensing a sulphonic acid of a novolak prepared from phenol, cresol, their homologues, or naphthols, with a compound which contains in the molecule an active methylol group and an amino group and which is made by reacting urea and/or thiourea and ammonia together with an aldehyde in acid solution. In an example, a compound which has the probable formula <FORM:0649516/IV (b)/1> is prepared by mixing formaldehyde solution, aqueous ammonia, and sulphuric acid, heating to 70 DEG C., adding urea solution gradually and continuing heating. The product is then reacted in the presence of formic acid with a product obtained by sulphonation of a novolak prepared by reacting, in acid medium, phenol and formaldehyde in the approximate molar ratio of 2 : 1. More formic acid is then added. As a modification, phenols, phenolic resins, lignin sulphonic acids or other sulphonic acids may be admixed with the novolak sulphonic acid starting material. The products may be used in the free state, buffered, or as their ammonium, sodium, chromium or aluminium salts to which formic or oxalic acid may be added. Specification 644,451, [Group IV (a)], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB873747A GB649516A (en) | 1947-04-01 | 1947-04-01 | Process of manufacturing synthetic tannin from aromatic sulphonic acids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB873747A GB649516A (en) | 1947-04-01 | 1947-04-01 | Process of manufacturing synthetic tannin from aromatic sulphonic acids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB649516A true GB649516A (en) | 1951-01-31 |
Family
ID=9858295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB873747A Expired GB649516A (en) | 1947-04-01 | 1947-04-01 | Process of manufacturing synthetic tannin from aromatic sulphonic acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB649516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020132736A1 (en) * | 2018-12-27 | 2020-07-02 | Suzano S.A. | Novolac phenolic resins, process of synthesis of said phenolic resins and use thereof |
-
1947
- 1947-04-01 GB GB873747A patent/GB649516A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020132736A1 (en) * | 2018-12-27 | 2020-07-02 | Suzano S.A. | Novolac phenolic resins, process of synthesis of said phenolic resins and use thereof |
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