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o-Cresol

About: o-Cresol is a research topic. Over the lifetime, 70 publications have been published within this topic receiving 1185 citations. The topic is also known as: ortho-Cresol & 2-Cresol.


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Patent
29 Jan 2014
TL;DR: In this article, a method for synthesizing o-cresol by gas phase catalysis was proposed, which comprises the following steps: feeding excessive methanol steam and phenol steam to a fixed bed filled by a composite catalyst.
Abstract: The invention relates to a method for synthesizing o-cresol by gas phase catalysis. The method comprises the following steps: feeding excessive methanol steam and phenol steam to a fixed bed filled by a composite catalyst; and by taking methanol steam as a carrier gas, carrying out gas phase catalysis alkylation to further synthesize o-cresol and 2, 6-xylenol, wherein the temperature of the fixed bed is 370-430 DEG C, the pressure is 0.02-0.1MPa, the phenol load is 40-60g/L catalyst L.h, and the gas velocity of methanol steam is 0.25-0.35m /L catalyst L.h. The method has the advantages that by taking phenol as a raw material, in the process, excessive methanol steam is not only the raw material, but also the carrier gas, so that the carrier gas which is additionally used is avoided; the recovered methanol and phenol are recycled, the phenol conversion ratio is high, and the accumulated molar yield (based on phenol) of o-cresol still reaches over 61%.

1 citations

Patent
09 Feb 1993
TL;DR: In this article, a cresol isomer mixture is brought into contact with a solid acid catalyst (e.g. silica-alumina) in the presence of phenol at 150-500 deg.C under a pressure of 0-50kg/cm G for 0.4-2.5hr to carry out isomerizing transalkylation.
Abstract: PURPOSE:To obtain in an economically advantageous way the subject compound useful as a raw material for herbicides and insecticides by isomerizing transalkylation of a cresol isomer mixture and by superfractionating distillation of the resulting o-cresol-contg. mixture. CONSTITUTION:Firstly, a cresol isomer mixture is brought into contact with a solid acid catalyst (e.g. silica-alumina) in the presence of phenol at 150-500 deg.C under a pressure of 0-50kg/cm G for 0.4-2.5hr to carry out isomerizing transalkylation. The resulting mixture containing o-cresol is then superfractionated by distillation to separate the o-cresol from the other components. The mixture other than the o-cresol is circulated to the isomerizing transalkylation process. 0.2-5mol of the phenol is used per mol of the cresol isomer mixture.

1 citations

Patent
24 Jun 2015
TL;DR: In this article, the authors presented a method for preparing o-cresol and 2, 6-xylenol by catalysis of heteropolyacid, which is suitable for industrial production completely.
Abstract: The invention provides a method for preparing o-cresol and 2, 6-xylenol by catalysis of heteropolyacid. The method includes: mixing phenol with methyl alcohol in a molar ratio of 1:1-20; gasifying at the temperature of 200-350 DEG C, wherein the weight space velocity of the phenol is 0.1-1h ; under the condition of inert gas shielding, reacting via a bed containing the heteropolyacid to obtain the o-cresol and the 2, 6-xylenol. The heteropolyacid is carried on an SiO2, activated carbon, TiO2 or MCM-41 carrier. The method for preparing the o-cresol and the 2, 6-xylenol by catalysis of the heteropolyacid has the advantages that mild reaction condition is achieved since the temperature only ranges from 250 DEG C to 300 DEG C, simplicity in reaction operation is achieved, conversion rate of the phenol and selectivity of the o-cresol and the 2, 6-xylenol are high, the proportion between the o-cresol and the 2, 6-xylenol can be adjusted, and the method is suitable for industrial production completely.

1 citations

DOI
01 Oct 1998
TL;DR: In this article, the effects of phenol to methanol mole ratio and Weight Hourly Space Velocity (WHSV) were examined for high phenol conversion and product selectivity.
Abstract: Alkylation of phenol with methanol was carried out over Lewis acid ion exchangedY-zeolites, FeY, ZnY, CdY and LaY at temperatures of 523, 573, 623, 673 and 698 K. The products obtained wereo-cresol, 2,6-xylenol and anisole. The effects of phenol to methanol mole ratio and Weight Hourly Space Velocity (WHSV) were examined for high phenol conversion and product selectivity. Phenol conversion decreased with increase of temperature over all the catalysts due to coke deposition. Selectivity too-cresol decreased with increase of temperature as it, once formed, became the reactant for formation of 2,6-xylenol. Selectivity to 2,6-xylenol increased with increase of temperature indicating high activation energy for its formation. Selectivity to anisole, although formed less than 10% over all the catalysts, decreased with increase of temperature due to its conversion too-cresol and then to 2,6-xylenol. In addition, selectivity to anisole also decreased with decrease of phenol to methanol feed ratio and WHSV. The study of time on stream showed preferential blocking of strong acid sites by coke deposits and hence these site dependent formations ofo-cresol and 2,6-xylenol were greatly reduced but free weak acid site dependent anisole formation increased with time.

1 citations

Journal Article
TL;DR: Alkylation of phenol and cresols with ethanol in the presence of an iron-aluminum catalyst was studied in this paper, and the results showed that phenol was more stable than cresol.
Abstract: Alkylation of phenol and cresols with ethanol in the presence of iron-aluminum catalyst was studied.

1 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20201
20171
20162
20155
20143
20133