68 results about "P-Toluic acid" patented technology

The invention provides non-naturally occurring microbial organisms having a (2-hydroxy-3-methyl-4-oxobutoxy)phosphonate pathway, p-toluate pathway, and / or terephthalate pathway. The invention additionally provides methods of using such organisms to produce (2-hydroxy-3-methyl-4-oxobutoxy)phosphonate pathway, p-toluate pathway or terephthalate pathway.

Topically applicable cosmetic / dermatological photoprotective compositions contain at least one dibenzoylmethane UV-screening agent, and, as a photostabilizer therefor, at least one arylalkyl benzoate compound of formula (I) or (II) below:with the proviso that:(i) the subject compositions are characteristically devoid of any octyl methoxycinnamate; and(ii) same are other than a solution of butyl methoxydibenzoylmethane in 2-phenylethyl benzoate, 2-phenylethyl o-toluate, 2-phenylethyl p-toluate or in a 2-phenylethyl o-toluate / 2-phenylethyl p-toluate (1 / 1) mixture.

A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.

The invention provides non-naturally occurring microbial organisms having a toluene, benzene, p-toluate, terephthalate, (2-hydroxy-3-methyl-4-oxobutoxy)phosphonate, (2-hydroxy-4-oxobutoxy)phosphonate, benzoate, styrene, 2,4-pentadienoate, 3-butene-1ol or 1,3-butadiene pathway. The invention additionally provides methods of using such organisms to produce toluene, benzene, p-toluate, terephthalate, (2-hydroxy-3-methyl-4-oxobutoxy)phosphonate, (2-hydroxy-4-oxobutoxy)phosphonate, benzoate, styrene, 2,4-pentadienoate, 3-butene-1ol or 1,3-butadiene.

The invention discloses an extraction method for reducing emission of chemical oxygen demand (COD) in pure terephthalic acid (PTA) wastewater. The method includes that a solvent is firstly used for extracting and removing a large amount of organic carboxylic acid of benzoic acid, p-toluic acid, p-carboxyl benzyl alcohol, p-carboxybenzaldehyde and terephthalic acid, and then a gas stripping method is used to remove a residual extracting agent in the wastewater so that COD concentration in the wastewater is greatly reduced; simultaneously, organic carboxylic acid which is extracted into an extracting agent phase returns to a PTA device with the extracting agent, and the p-toluic acid, the p-carboxyl benzyl alcohol, the p-carboxybenzaldehyde and the terephthalic acid in the organic carboxylic acid are finally converted into PTA products through the PTA device so that a large quantity of useful organic substances in the wastewater are recycled, and economic benefits are increased; and outlet gases of a gas stripping tower, which carry the extracting agent, are returned to the PTA device so that the extracting agent is recycled, and consumption of the extracting agent is low. The extraction method is high in efficiency, low in consumption and capable of reducing emission of COD, reducing loads of sewage treatment stations and partially achieving resource utilization of the wastewater.

The invention discloses a method for recycling mother solid in PTA-refining wastewater, comprises the following steps: mixing PTA-refining wastewater and paraxylene in a prepositioned mixing tank, carrying out single-stage extraction and cooling on the wastewater, dissolving and extracting the solid in mother liquor into a PX phase, returning the extract phase PX discharged from a clarification tank to an oxidizing reaction system, and delivering the wastewater to an extraction tower to be subject to multistage countercurrent extraction; delivering the wastewater discharged from the bottom ofthe extraction tower to be subject to further treatment; and returning the extraction phase discharged from the top of the extraction tower to serve as extract liquor for single-stage extraction. By adopting the method in the invention, most of organic matters, such as p-toluic acid, terephthalic acid and the like in the wastewater can be recycled, thus the purpose of recycling wastes is achieved, and wasting of resources is avoided; and the invention omits the conventional filtering unit, saves the filter cloth-replacing cost, ensures that the extraction tower can operate at appropriate operating temperature, and has the advantages of investment saving, low energy consumption, high resource recovery rate and the like.