11 results about "P-chlorotoluene" patented technology

In highly selective oxidation of parachlorotoluene to parachlorobenzaldehyde, catalytic activity and selectivity were insufficient, the environmental impact was high, and there were issues with catalyst reusability. [Solution] The present invention provides a manganese oxide-supported cobalt chromium catalyst, a method for producing the same, and a method for producing parachlorobenzaldehyde by oxidizing parachlorotoluene using the same. This catalyst is prepared by dissolving a certain amount of manganese salt and metal salt precursors of cobalt and chromium, measured based on the support ratio, in deionized water and stirring to obtain a mixed solution. Acid is added to the resulting solution, and the mixture is heated and stirred. The resulting solid is then filtered, washed, and calcined. The resulting catalyst is used in the selective oxidation of parachlorotoluene, achieving high conversion and selectivity. The catalyst of the present invention is inexpensive to produce, environmentally friendly, and easy to recover and reuse. Furthermore, it exhibits excellent reaction activity and product selectivity despite relatively mild reaction conditions, making it suitable for industrial use.

The present application relates to the synthesis of pesticide compounds, in particular to a method for preparing a pyrasulfotole intermediate. The method comprises: (1) using p-chlorotoluene as a raw material, through nitration, chlorination, hydrolysis, or chlorination, hydrolysis, nitration, to obtain 3-nitro-4-chlorobenzaldehyde, (2) fluorination and reduction of 3-nitro-4-chlorobenzaldehyde to obtain 4-fluoro-3-amino benzaldehyde; (3) 4-fluoro-3-amino benzaldehyde is then contacted with chloroformate for reaction, and then chlorination to obtain compound IV; (4) compound IV is contacted with trifluorobutanamine ester under alkaline conditions for reaction to obtain compound I. The process for preparing compound I avoids using expensive raw material 2-chloro-4-fluorobenzoic acid, effectively reduces the cost of raw materials, reduces the three wastes generated in the process, and at the same time, the total yield of the reaction is high, and it is suitable for industrial mass production.

The invention discloses a system for producing o-(p-) chlorobenzyl chloride by'reacting first and then separating 'mixed o-(p-) chlorotoluene. The invention discloses a process for producing o (p) chlorobenzyl chloride from mixed o (p) chlorotoluene by'reaction-separation ', which comprises the following steps: carrying out side chain photochlorination reaction on the mixed o (p) chlorotoluene and chlorine in a photochlorination reactor, feeding the chlorination liquid into a deacidification tower for degassing operation, feeding the deacidified chlorination liquid into a chlorotoluene removal tower for rectifying to remove the mixed chlorotoluene, and feeding the deacidified chlorination liquid into a dechlorination tower for dechlorination; a tower kettle material enters an o-chlorobenzyl chloride refining tower, an o-chlorobenzyl chloride product is extracted after a tower top material of the o-chlorobenzyl chloride refining tower is condensed, a tower kettle material enters an o-chlorobenzyl chloride removal refining tower, a tower top material of the o-chlorobenzyl chloride removal refining tower is condensed and then returns to the o-chlorobenzyl chloride refining tower, and a tower kettle material enters a p-chlorobenzyl chloride refining tower; and condensing a material at the top of the p-chlorobenzyl chloride refining tower, and extracting a p-chlorobenzyl chloride product. According to the method, the separation difficulty is reduced, and the separation energy consumption is saved.

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 3, 4-dichlorobenzotrifluoride, which comprises the following steps: firstly, adding dibenzoyl peroxide and N-hydroxyphthalimide into parachlorotoluene, and performing side chain chlorination reaction under ultraviolet irradiation and chlorine atmosphere to generate parachlorobenzotrifluoride; secondly, the obtained p-chlorobenzotrifluoride and tetrabutylammonium fluoride and potassium fluoride composite fluorination reagent are subjected to a fluorination reaction in the presence of a copper powder-1, 10-phenanthroline complex, and p-chlorobenzotrifluoride is prepared; and finally, under the catalysis of the mesoporous silica supported ferric trichloride catalyst, performing aromatic electrophilic chlorination on chlorobenzotrifluoride and sulfuryl chloride to obtain the high-purity 3, 4-dichlorobenzotrifluoride. Through synergistic application of photochemical chlorination, a composite fluorination system and the supported catalyst, the method has the advantages of mild reaction conditions, safe operation, high yield and good selectivity, and is suitable for industrial production.

The invention discloses a method for preparing p-chlorobenzaldehyde through selective oxidation of p-chlorotoluene, which comprises the following steps: in a stirring type reaction kettle, taking p-chlorotoluene or a mixture of p-chlorotoluene and p-chlorobenzaldehyde as a liquid-phase raw material, taking a variable-valence metal complex as a main catalyst, and taking chloride and / or iodide as a cocatalyst; introducing oxygen-containing gas to carry out oxidation reaction; the height-diameter ratio of the stirring type reaction kettle is (5-8): 1, and a stirring paddle and a porous sintering gas distributor are arranged in the stirring type reaction kettle; and the difference between the height-diameter ratio of the stirring type reaction kettle and the layer number of the stirring paddles is 2. By optimizing the reactor and the catalytic system, the reactant conversion rate and the p-chlorobenzaldehyde selectivity can be improved, the reaction temperature is greatly reduced, and the use of bromide is avoided.

The invention discloses a method for synthesizing o-chlorotoluene and parachlorotoluene through selective chlorination of toluene. The method comprises the following steps: adding tungstic acid and a tungstic acid active center phase distribution regulation and control aid into toluene, uniformly stirring, then adding a hydrochloric acid solution, dropwise adding hydrogen peroxide while stirring, and heating for reaction to obtain chlorotoluene. The tungstic acid active center phase distribution regulation auxiliary agent is an ion pair system formed by organic onium cations and strong acid stable anions; the organic onium cation is a quaternary phosphonium cation; and the strong acid stable anions are selected from hydrogen sulfate anions, phosphate anions or sulfonate anions. Tungstic acid is used as a catalyst, concentrated hydrochloric acid is used as a chlorine source, hydrogen peroxide is used as an oxidizing agent, and a tungstic acid active center phase distribution regulation auxiliary agent is used for realizing interphase dynamic exchange to carry out toluene chlorination reaction. According to the method, the conversion rate in the toluene chlorination reaction and the selectivity of chlorinated products can be improved, the waste hydrochloric acid can be applied in a green and efficient manner, the cost is effectively reduced, and the method is an important method beneficial to industrial production of chlorotoluene.

The invention belongs to the technical field of sewage treatment equipment, and particularly relates to o (p) chlorotoluene production sewage synchronous treatment equipment which comprises a support, and an extraction mechanism is mounted in the middle of the support. Light and heavy phase solutions can be mixed through operation of the extraction mechanism, the purpose of preliminarily and uniformly mixing the mixed solution is achieved, the extraction mechanism drives the separation mechanism to synchronously operate, the mixed solution is impacted and disturbed through the fixed inclined struts distributed in the separation mechanism in a staggered mode, and the mixed solution is further uniformly mixed; the extraction mechanism drives the stirring mechanism to rotate in an accelerated manner in the direction opposite to the operation direction of the extraction mechanism through the cooperation of the separation mechanism and the linkage mechanism, solution hedging can be locally formed, a mixed solution is uniformly mixed again, the mixing uniformity of a light-phase solution and a heavy-phase solution is remarkably improved, the contact time of the two phases is prolonged, and the extraction efficiency is improved. The problem of low extraction efficiency caused by poor mixing effect of existing equipment is effectively solved.

This invention discloses a chlorotoluene chlorination reactor based on photochlorination, comprising a reactor body with a lid, several ultraviolet lamps arranged in a ring array between the reactor body and a quartz protective cover, a chlorine gas inlet distribution assembly located at the bottom of the reactor body, and a vortex stirring assembly located inside the reactor body. In this invention, the ultraviolet light source is uniformly irradiated into the reactor body when the ultraviolet lamps pass through the reflector strip, causing the chlorotoluene material to undergo a photochlorination reaction. The vortex ring at the bottom of the reactor body creates a vortex effect on the chlorotoluene material, causing the chlorotoluene material to rotate in the vortex. The stirring blades create a shearing force, ensuring that the chlorotoluene material is fully mixed and participates in the photochlorination reaction. The arc-shaped stirring blades allow the chlorotoluene material to flow and stir from the center to the periphery in the reactor body, further ensuring that the chlorotoluene material has sufficient contact with the ultraviolet light source and improving the efficiency of the photochlorination reaction.

The application discloses a method for synthesizing meta-chlorotoluene through heterogeneous catalytic isomerization, and has the advantages of stable catalyst, easy recovery, green sustainability, high selectivity of the product meta-chlorotoluene and the like, and is a method for synthesizing meta-chlorotoluene with wide prospects. The method comprises the following steps: filling modified HZSM-5 molecular sieve into a fixed bed reaction constant temperature area and placing the fixed bed reaction constant temperature area in an inert atmosphere, feeding a mixture of raw material p-chlorotoluene and a diluent into the fixed bed reactor through a constant flow pump for preheating and vaporization, and then performing catalytic isomerization reaction in the fixed bed reaction constant temperature area, and collecting the product meta-chlorotoluene after condensation.

The invention belongs to the field of chemical purification, and relates to a method for preparing high-purity parachlorotoluene through current pulse-assisted continuous suspension melt crystallization, which is characterized in that current pulse with specific parameters is applied in the suspension melt crystallization process for assistance, and a pulse electric field effect and directional energy input are utilized, so that the crystallization induction period can be remarkably shortened, and the high-purity parachlorotoluene can be prepared. The crystallization time is shortened by 50%-95% compared with that of a traditional method, the purity, the yield and the particle size are improved, and finally pure parachlorotoluene with the purity larger than or equal to 99.9% is obtained. No additional solvent is needed in the whole process, and the method has the advantages of being high in controllability, low in energy consumption, high in efficiency, capable of achieving continuity and the like, and is a green and efficient melt crystallization strengthening technology.

The invention discloses a kind of energy-saving system of multiple-effect distillation integration with low-pressure drop rectifying tower, including parachlorine tower, adjacent chlorine tower, parachlorine tower is equipped with the first reboiler, and adjacent chlorine tower is equipped with the second reboiler;The middle part of parachlorine tower is respectively provided with the first feed opening, the second feed opening, parachlorine tower reactor is provided with discharge pipeline, and discharge pipeline is provided with heat exchanger, and feed pipeline is connected with the first feed opening through heat exchanger;Parachlorine tower top gas outlet is respectively connected with the reflux port of parachlorine tower, adjacent chlorine tower through the second reboiler;Adjacent chlorine tower is provided with the 3rd feed opening, the 4th feed opening, adjacent chlorine tower top gas outlet is connected with the first condenser, the second condenser in sequence, and the feed pipeline of adjacent chlorine tower is connected with the 3rd feed opening through the first condenser;Adjacent chlorine tower reactor discharge port is connected with the second feed opening of parachlorine tower.The present invention system effectively reduces the pressure drop of rectifying tower, realizes the low-energy consumption smart separation of mixed ortho / parachlorotoluene system.