8 results about "Methyl isocyanate" patented technology

The invention discloses a reaction kettle flow control device for methyl isocyanate production, and relates to the field of reaction containers, the reaction kettle flow control device comprises a reaction kettle, a stirrer, a guide cylinder, an atomizer and a flow control disc are arranged in the reaction kettle, the flow control disc is arranged above the guide cylinder, and the flow control disc can move in the axial direction of the reaction kettle to get close to or away from the guide cylinder; a plurality of conical holes with large upper parts and small lower parts are formed in the flow control disc in a penetrating manner, when liquid in the reaction kettle circularly flows, the liquid in the guide cylinder flows upwards and rushes out from the conical holes of the flow control disc, and the rushed liquid is in contact and mixed with atomized liquid drops sprayed by the atomizer; by arranging the flow control disc and the conical holes formed in the flow control disc, liquid in the flow guide cylinder flows upwards and rushes out of the conical holes of the flow control disc, so that the liquid level is reconstructed into a thick umbrella-shaped liquid film which is uniformly distributed on the premise of not influencing the stirring effect, the liquid level is effectively expanded, and the stirring effect is improved. The adding speed and the stirring speed of the atomizer are adjusted in real time according to the mixing process, and the absorption efficiency is improved.

The application discloses a kind of methyl isocyanate production water washing system, including water washing tank and solvent recovery tank, recovery solvent pump is equipped on feed pipe, water washing tank bottom is connected with solvent recovery tank by bottom reflux pipe, mixed liquid tank is connected with feed pipe near water washing tank, overflow pipe one end in the upper side of water washing tank is connected with tail gas acid tower, and deionized water delivery pipe is connected with the lower side of water washing tank one side.Use, the trichloromethane discharged from the bottom of layered tank enters solvent recovery tank, and by the back and forth switching of control valve on deionized water delivery pipe, overflow valve and control valve on feed pipe, and cooperate with the judgment of liquid level in solvent recovery tank, recovery solvent pump is started, and trichloromethane in solvent recovery tank is sent into water washing tank to be washed by water;Trichloromethane after washing finally goes mixed liquid tank, HCl is sent to tail gas acid tower by overflow pipe, and then trichloromethane and HCl can be separated and recovered separately, the purity of trichloromethane can be improved, and it is conducive to the preparation of methyl isocyanate.

The invention provides a non-aqueous electrolyte additive for a silicon negative electrode ternary high-voltage lithium battery, a non-aqueous electrolyte and the silicon negative electrode ternary high-voltage lithium battery. The non-aqueous electrolyte additive comprises fluoroethylene carbonate, vinylene carbonate, a lithium salt additive and an additive A, the additive A has a structure shown in the formula 1, and R1 and R2 are respectively and independently selected from at least one of alkyl, fluoroalkyl, vinyl, allyl, ethynyl, propynyl, acetyl, fluoroacetyl, sulfuryl and methyl isocyanate; additive A also achieves equivalent replacement with vinylene carbonate. The non-aqueous electrolyte additive has the advantages that the non-aqueous electrolyte additive can quickly and well remove water and reduce acid for the non-aqueous electrolyte, the problem of dissolving positive and negative materials by HF (hydrogen fluoride) is solved, and equivalent replacement with vinylene carbonate is realized, so that the problem of overhigh impedance caused by overhigh addition amount of the vinylene carbonate is avoided; and the problem that the SEI film is seriously damaged due to expansion and shrinkage of the silicon material is solved.

The invention relates to toothpaste essence based on a microcapsule technology and a preparation method of the toothpaste essence. According to the essence, modified essence molecules are wrapped by a microcapsule technology, so that slow and controllable release of the essence is realized. Modified essence molecules are esterified with acetic acid, react with methyl isocyanate to introduce amino groups, react with ethanol to introduce carboxyl groups, and react with ethylamine to introduce aldehyde groups, so that the stability, durability and controlled release performance of the essence molecules are enhanced. Through a microcapsule wrapping technology, the essence can be kept for a long time, and rapid volatilization of the essence is avoided. According to the technology, the essence can be released for a longer time in the toothpaste essence, the stability and the oxidation resistance of the essence are improved, and the use experience of a user is remarkably improved.

The invention provides a light-cured polyurethane acrylate oligomer and a preparation method thereof. The light-cured polyurethane acrylate oligomer is prepared from the following raw materials: 1, 4-bis (isocyanate methyl ester) cyclohexane, a hydroxyl acrylate monomer, a catalyst, a polymerization inhibitor and a reactive diluent. According to the invention, 1, 4-bis (isocyanate methyl ester group) cyclohexane is adopted as a source of diisocyanate, and the contained 1, 4-cyclohexane dimethylene group can endow the polyurethane acrylate oligomer with better rigidity, wear resistance and chemical stability. According to the present invention, the hydroxyl acrylate monomer can provide the hydroxyl group capable of reacting with the-NCO group, the allyl group contained in the hydroxyl acrylate monomer can produce the high-efficiency free radical through the ultraviolet irradiation, and the high-efficiency free radical is subjected to the polymerization reaction to cure, such that the prepared polyurethane acrylate oligomer can be in the light curing form, therefore, the compound can be used in the fields of ultraviolet-cured coatings, printing ink, adhesives, 3D printing photosensitive materials and the like.

A resin includes a cured product of a polymerizable composition including a compound represented by the following general formula (1) and a thiol compound having one or more mercapto groups, and a biomass degree of the resin is 15% or more. In the general formula (1), each of R1 and R2 independently represent a hydrogen atom or a methyl group, and n represents an integer of 0 or 1.

The present invention discloses a flow control device for a reaction kettle in the production of methyl isocyanate, which relates to the field of reaction vessels and includes a reaction kettle. A stirrer, a draft tube, an atomizer and a flow control plate are arranged in the reaction kettle. The flow control plate is arranged above the draft tube and can move axially along the reaction kettle to approach or move away from the draft tube. A number of conical holes in a shape of being large at the top and small at the bottom are penetrated through the flow control plate. When the liquid in the reaction kettle circulates and flows, the liquid in the draft tube flows upward and gushes out from the conical holes of the flow control plate, and the gushing liquid contacts and mixes with the atomized droplets sprayed by the atomizer; by arranging the flow control plate and the conical holes formed thereon, the liquid in the draft tube flows upward and gushes out from the conical holes of the flow control plate, so as to reconstruct the liquid surface into a relatively thick umbrella-shaped liquid film with a relatively uniform distribution without affecting the stirring effect, effectively expand the liquid surface, and adjust the addition speed of the atomizer and the stirring speed in real time according to the mixing process to improve the absorption efficiency.

The application discloses a preparation method of terbucarb, which comprises the following steps: taking 2-methylamino-5-tert-butyl-1,3,4-thiadiazole hydrochloride as raw material, reacting with methyl isocyanate in water under the action of a phase transfer catalyst, adjusting the reaction solution to be neutral after the reaction is completed and the temperature is increased to 50-60 DEG C, cooling and crystallizing, filtering, washing and drying the filter cake, and obtaining terbucarb products. The preparation method has the advantages of high yield, less waste, low cost, simple operation and the like.