32 results about "Ortho-chlorotoluene" patented technology

The invention discloses a production method of ortho-chlorotoluene. The production method comprises toluene chlorinating, toluene removing and chorine mixed toluene rectifying steps. The method comprises the following steps of: during toluene chlorinating, putting toluene into a chlorinating kettle, and adding a catalyst; introducing chorine gas at the temperature of 40-60 DEG C for undergoing a chlorinating reaction; mixing the catalyst used in the reaction by using aluminum oxide and trichloride antimony; mixing with silica sol; and treating at the temperature of 80-120 DEG C for 4-6 hours. The method is simple and convenient, and is easy to operate; and in the total amount of parachlorotoluene and ortho-chlorotoluene in a final product, the ortho-chlorotoluene is over 44 percent. After rectification, the content of the product is over 99.5 percent.

The invention discloses a method for selectively preparing o-chlorotoluene, which is characterized in that a mixture of iron powder and a dibenzothiophene compound is used as a combined catalyst, and chlorine is introduced into toluene under a dark condition to obtain o-chlorotoluene. The temperature in the chlorination process is controlled to be 30-50 DEG C, and the conversion rate of toluene is 98-100% by controlling the chlorine introduction amount. The chlorination liquid obtained after the catalyst is applied to toluene chlorination takes o-chlorotoluene as a main product, the percentage content of o-chlorotoluene is effectively increased, the highest content of o-chlorotoluene reaches 68.50%, the content of m-chlorotoluene is smaller than 0.15%, the content of total dichlorotoluene is smaller than 2.21%, and the mass ratio of o-chlorotoluene to p-chlorotoluene reaches 2.28.

The invention discloses a method and a device for producing dichlorotoluene by tower-type continuous chlorination. The method comprises the following steps of: uniformly stirring a raw material namelyo-chlorotoluene and a solid powder catalyst to form a configuration liquid, feeding the configuration liquid into a tower-type reactor from the bottom of the tower-type reactor, continuously introducing chlorine gas into the tower-type reactor from the bottom of the tower-type reactor for chlorination reaction, and cooling the obtained chlorination liquid by an external circulation heat exchanger, and controlling the reaction temperature to be 25-40 DEG C; and when the conversion rate of the raw material namely o-chlorotoluene in the chlorination liquid reaches 45-75% and the selectivity of the 2,6-dichlorotoluene reaches 25% or more, discharging the chlorination liquid continuously, continuously introducing the configuration liquid at the same time, wherein the quantity of the introducedconfiguration liquid is ensured to be slightly smaller than the discharge quantity. The process is reasonable, the yield is high, the productivity is large, the device is simple, and the investment cost is low.

The invention relates to the technical field of chemical production, in particular to a method for co-producing o-chlorobenzyl chloride, o-chlorobenzyl dichloride and o-chlorobenzyl trichloride by chlorination of o-chlorotoluene, which comprises the following steps of: performing chlorination reaction on o-chlorotoluene serving as a raw material and chlorine, sampling, analyzing and controlling the content of components in the reaction material, rectifying and co-producing to obtain o-chlorobenzyl chloride, o-chlorobenzyl dichloride and o-chlorobenzyl trichloride. According to the method, benzoyl peroxide is taken as an initiator, and a metal ion masking agent is added into the raw material before chlorination reaction, so that metal ions in the raw material can be removed, side reaction can be inhibited, and the catalytic efficiency of the initiator is improved. The method is low in reaction temperature, mild in reaction, easy to control, high in reaction conversion rate, few in by-product and high in product purity.

The invention discloses a novel chlorination process of o-chlorobenzotrichloride, wherein o-chlorotoluene is used as a raw material, and side chain chlorination, pressure reducing rectification, neutralization, filtration and other steps are performed to obtain the target compound o-chlorobenzotrichloride. Compared with the process in the prior art, the process of the invention has the following characteristics that the step-by-step catalytic process is adopted, the reaction conditions are mild, no special equipment is added in the production process, the side chain trichlorination selectivityis high, the generation of monochlorides, dichlorocompounds, side chains and benzene ring chlorination byproducts is greatly reduced, the separation and purification process is simplified, the emission of three organic wastes is reduced, and the yield is about 99% and is about 10% higher than the yield of the common chlorination process.

The invention relates to the technical field of chemical production, in particular to a production method of double-kettle-switching continuous chlorination. According to the invention, two reaction kettles are connected in series, and the double reaction kettles are alternately switched to serve as a main reaction kettle and an auxiliary reaction kettle for a chlorination reaction; after a solution in the kettle serving as the main reaction kettle is sampled and detected to meet requirements, the reaction of the main reaction kettle is finished, introduction of chlorine into the main reaction kettle and the auxiliary reaction kettle is stopped, the main reaction kettle enters a discharging procedure, and the auxiliary reaction kettle is allowed to enter a heat preservation state; as materials are further fed into the main reaction kettle, chlorine is continuously introduced into the main reaction kettle for a reaction, and the main reaction kettle and the auxiliary reaction kettle are switched when the main reaction kettle does not contain or contains a small amount of o-chlorotoluene; and the original auxiliary reaction kettle serves as the main reaction kettle for a reaction, introduction of chlorine is stopped and the reaction is stopped until the solution in the original auxiliary reaction kettle is sampled and detected to be qualified, then cooling and discharging are conducted, and the original main reaction kettle is used as the auxiliary reaction kettle to maintain a reaction temperature in the kettle. According to the invention, the continuous production of the chlorination reaction can be realized, a chlorine content in tail gas is reduced, and the raw material entrainment in the tail gas is reduced.

The invention discloses a method for preparing chlorobenzaldehyde through catalytic oxidation of chlorotoluene. According to the method, a high-pressure reaction kettle is adopted as a reactor, M/Al-MCM-41 (M=Co, Mn) loaded metal oxide is adopted as a catalyst, an Al-MCM-41 molecular sieve is adopted as a carrier, Co and Mn are adopted as active components, oxygen is adopted as an oxidizing agent,KBr is adopted as a cocatalyst, and acetic acid is adopted as a solvent. The optimal reaction conditions are as follows: the reaction temperature is 120 DEG C, the reaction time is 10 hours, the catalyst dosage is 2.5%, the active component loading capacity is 13%, the Co/Mn ratio is 1/2, the cocatalyst dosage is 0.5%, the oxygen introduction control reaction pressure is not more than 0.2 MPa, the solvent dosage is 30%, the highest o-chlorotoluene conversion rate can reach 90%, and the highest chlorobenzaldehyde selectivity is 92%. The catalyst provided by the invention has the characteristics of good stability, low catalyst cost, environmental friendliness, simple reaction process and the like, and has a good industrial application prospect.

The invention relates to a preparation method of chlorotoluene, and belongs to the technical field of chemical material preparation. The method comprises the following steps: mixing toluene with a cocatalyst, then carrying out forced circulation reaction on the obtained mixture and chlorine in a plug flow reactor to obtain a mixed chlorotoluene crude product, carrying out dechlorination, deacidification and catalyst removal, and carrying out rectification separation to obtain o-chlorotoluene and p-chlorotoluene. The chlorotoluene preparation method provided by the invention has the advantages that the process is simple, the reaction process is easy to control, 75-95% of catalyst-containing high-boiling substances in a catalyst removal tower kettle can be recycled, the catalyst utilization rate is high, the discharge amount of wastes and tail gas is small, and the prepared target product has high purity.

The invention discloses a method for producing high-purity o-chlorotoluene, which comprises the following steps: filling a molecular sieve adsorbent in a tube pass of a tubular adsorption tower, introducing circulating cooling water into a shell pass of the tubular adsorption tower, and introducing an o-chlorotoluene raw material to be purified into the tube pass to be in full contact with the molecular sieve adsorbent to obtain o-chlorotoluene with the mass fraction greater than or equal to 99.95%, and carrying out desorption treatment on the molecular sieve adsorbent saturated by adsorption: heating for desorption, purging with nitrogen, and cooling. The method is easy to operate, continuous production of high-purity o-chlorotoluene can be achieved, and the high-purity o-chlorotoluene product with the mass fraction of 99.95% or above is obtained; according to the method disclosed by the invention, the raw material toluene for producing the o/p-chlorotoluene system is used as the regeneration solvent of the molecular sieve adsorbent, and the regenerated solution can be directly returned to the o/p-chlorotoluene production system, so that the recycling step of the regeneration solvent is avoided, the process route is simplified, and the treatment cost is reduced.

The invention relates to the technical field of 2,6-dichlorotoluene preparation, in particular to a method for preparing 2,6-dichlorotoluene employing selective chlorination of an Hbeta molecular sieve and catalytic o-chlorotoluene. With cheap o-chlorotoluene as a raw material, a chlorine gas as a chlorinating agent and the Hbeta molecular sieve as a catalyst, the 2,6-dichlorotoluene is prepared by selective chlorination of the catalytic o-chlorotoluene employing a one-step chlorination method. The method is easy to operate, simple in steps, relatively low in production cost and easy to industrialize.