DE236489C - - Google Patents
Info
- Publication number
- DE236489C DE236489C DENDAT236489D DE236489DA DE236489C DE 236489 C DE236489 C DE 236489C DE NDAT236489 D DENDAT236489 D DE NDAT236489D DE 236489D A DE236489D A DE 236489DA DE 236489 C DE236489 C DE 236489C
- Authority
- DE
- Germany
- Prior art keywords
- chlorinated
- toluene
- benzoic acid
- chlorination
- benzyl chloride
- 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.)
- Active
Links
- WPYMKLBDIGXBTP-UHFFFAOYSA-N Benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 12
- 239000005711 Benzoic acid Substances 0.000 claims description 6
- 235000010233 benzoic acid Nutrition 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 150000003613 toluenes Chemical class 0.000 claims description 6
- KCXMKQUNVWSEMD-UHFFFAOYSA-N Benzyl chloride Chemical compound ClCC1=CC=CC=C1 KCXMKQUNVWSEMD-UHFFFAOYSA-N 0.000 claims description 4
- WQYVRQLZKVEZGA-UHFFFAOYSA-N Hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 4
- 229940073608 benzyl chloride Drugs 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims 2
- 241000490025 Schefflera digitata Species 0.000 claims 1
- 235000015250 liver sausages Nutrition 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 4
- 238000005660 chlorination reaction Methods 0.000 description 4
- CAHQGWAXKLQREW-UHFFFAOYSA-N Benzal chloride Chemical compound ClC(Cl)C1=CC=CC=C1 CAHQGWAXKLQREW-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- HUMNYLRZRPPJDN-UHFFFAOYSA-N Benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 description 2
- XEMRAKSQROQPBR-UHFFFAOYSA-N Benzotrichloride Chemical compound ClC(Cl)(Cl)C1=CC=CC=C1 XEMRAKSQROQPBR-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 229940095076 benzaldehyde Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 125000004435 hydrogen atoms Chemical group [H]* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/29—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with halogen-containing compounds which may be formed in situ
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)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
PATENTSCHRIFTPATENT LETTERING
- ΛΙ 236489 KLASSE 12 o. GRUPPE- ΛΙ 236489 CLASS 12 or GROUP
Dr. ALFRED JESSNITZER in BERLIN.Dr. ALFRED JESSNITZER in BERLIN.
Bei der bisherigen Darstellung von Benzoesäure aus chloriertem Toluol bildete eine möglichst weitgehende Chlorierung und demgemäß der Gehalt an Benzotrichlorid einen Maßstab für die gute Ausbeute an Benzoesäure.In the previous representation of benzoic acid from chlorinated toluene, one formed as possible extensive chlorination and accordingly the content of benzotrichloride a benchmark for the good yield of benzoic acid.
Bei dem neuen Verfahren wird die Chlorierung etwa dann unterbrochen, wenn wenigstens ein Wasserstoffatom der Seitenkette durch Chlor substituiert ist.In the new process, the chlorination is interrupted approximately when at least one hydrogen atom of the side chain is substituted by chlorine.
ίο Ein in ähnlicher Weise chloriertes Toluol, also mit viel Gehalt an Benzylchlorid und wenig Gehalt an Benzalchlorid, wurde bereits als Ausgangsmaterial für die Herstellung Benzaldehyd verwendet, jedoch mit dem Unterschied, daß die Weiterverarbeitung des chlorierten Toluols durch Oxydation mittels der Oxyde von Mangan, Blei oder Eisen vorgenommen wurde, während bei dem vorliegenden Verfahren die Überführung des chlorierten Toluols in Benzoesäure durch Einwirkung von Chlorkalk oder einem anderen Hypochlorid bewerkstelligt wird.ίο A similarly chlorinated toluene, So with a lot of benzyl chloride and little benzal chloride, was already used as starting material for the production of benzaldehyde, but with the difference that the further processing of the chlorinated toluene made by oxidation by means of the oxides of manganese, lead or iron was, while in the present process the conversion of the chlorinated Toluene in benzoic acid by the action of chlorinated lime or another hypochlorite is accomplished.
Abgesehen von den verschiedenen Endprodukten liegt ein wesentlicher Unterschied beider Verfahren auch für die Technik darin, daß die Apparatur einem weit geringeren Verschleiß unterworfen wird. Die durch Verseifung und Oxydation herbeigeführte chemische Umsetzung tritt beim Kochen mit Chlorkalk leicht und schnell ein und kann durch geeignete Katalysatoren (Metallverbindungen, die in zwei Oxydationsstufen auftreten) beschleunigt werden, wobei eine Ersparnis an Oxydationsmitteln mittels Durchleitens von Luft herbeigeführt werden kann.Apart from the different end products, there is an essential difference between the two Process also for the technology in that the apparatus is subject to far less wear is subjected. The chemical reaction brought about by saponification and oxidation occurs easily and quickly when boiling with chlorinated lime and can be removed by using suitable Catalysts (metal compounds that occur in two oxidation stages) are accelerated, with a saving of oxidizing agents can be brought about by passing air through.
Das neue Verfahren ist in erster Linie mit einem erheblichen Zeitgewinn verbunden, da der erwähnte Chlorierungsgrad zur hauptsächlichen Bildung von Benzylchlorid neben wenig Benzalchlorid und sehr wenig Benzotrichlorid bald erreicht wird (etwa in ein Viertel der Zeitdauer der bisher üblichen Chlorierung).The new method is primarily associated with a considerable gain in time, since the mentioned degree of chlorination for the main formation of benzyl chloride besides little Benzal chloride and very little benzotrichloride is reached soon (about a quarter of the time the previously common chlorination).
Ferner wird durch das neue Verfahren vermieden, daß Chlor ungenutzt verloren geht und die als Nebenprodukt erhaltene Salzsäure verunreinigt wird. Die nach dem Verfahren hergestellte Benzoesäure wird in fast quantitativer Ausbeute und frei von Nebengerüchen erhalten.Furthermore, the new process prevents chlorine from being lost unused and the hydrochloric acid obtained as a by-product is contaminated. The after the procedure Benzoic acid produced is produced in almost quantitative yield and free of side odors obtain.
Das anchlorierte Toluol, bestehend aus etwa 2 Mol. Benzylchlorid und 1 Mol. Benzalchlorid läßt man allmählich in eine kochende Lauge, die 5 Mol. Chlorkalk (als 100 Prozent berechnet) und 4 Mol. Schlemmkreide enthält, zufließen, wobei die Verdünnung mit Wasser etwa das 100 bis 200 fache (auf Chlorkalk berechnet) sein kann. Das Kochen wird fortgesetzt, bis eine Probe mit Salzsäure versetzt kein Chlor mehr entwickelt. Nachdem etwa unverändertes Material mit Wasserdampf abgeblasen und die Lauge filtriert ist, gewinnt man durch Fällen mit Salzsäure in bekannter Weise Benzoesäure, die auf schon bekannte Weise gereinigt wird.The partially chlorinated toluene, consisting of about 2 moles of benzyl chloride and 1 mole of benzal chloride one leaves gradually in a boiling lye, the 5 mol. chlorinated lime (calculated as 100 percent) and 4 mol. of chalk contains, whereby the dilution with water about the 100 to 200 times (calculated on chlorinated lime). Cooking continues until a sample mixed with hydrochloric acid no longer develops chlorine. After about unchanged Material is blown off with steam and the lye is filtered, can be obtained by felling with hydrochloric acid in a known manner benzoic acid, which is purified in a known manner.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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DE236489C true DE236489C (en) |
Family
ID=496171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DENDAT236489D Active DE236489C (en) |
Country Status (1)
Country | Link |
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DE (1) | DE236489C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563820A (en) * | 1947-10-04 | 1951-08-14 | California Research Corp | Preparation of aryl dicarboxylic acids |
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0
- DE DENDAT236489D patent/DE236489C/de active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2563820A (en) * | 1947-10-04 | 1951-08-14 | California Research Corp | Preparation of aryl dicarboxylic acids |
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