38 results about "Recycling by product" patented technology

The invention discloses a method for preparing a paint raw material from a paint waste residue, and the method comprises the following steps of: preprocessing the paint waste residue, classifying, removing impurities, then adding an additive and a protecting agent, and uniformly dispersing; sending the preprocessed paint waste residue to an organic waste recycling system, setting a proper temperature and then carrying out separation modification; recycling solid components to form thick plaster-shaped modified resin and packaging; collecting mixed steam of a solvent and water through gas and then condensing so as to separate gas from liquid, carrying out tail gas purification on the gas part and discharging the gas part when the gas part reaches the standard, carrying out oil-water separation on the liquid part to ensure that water is separated from the solvent, collecting the solvent for concentrated utilization, and carrying out wastewater treatment on the water and then dischargingwhen the gas part reaches the standard. A large quantity of organic solvent is not adopted in the method, water can be well separated from the paint waste residue, and the prepared paint raw materialhas the advantages of lower organic solvent content, lower danger and the like, thus the paint raw material can be safely used in various medium- and low-end coating raw materials.

The invention discloses a method for simultaneously removing PM2.5 particles, SO2 and NOx of smoke gas and reclaiming byproducts. The smoke gas to be treated is introduced to a pulse corona electric field and absorption liquid is sprayed to purify the smoke gas at the same time; the pulse corona electric field is produced by an acicular corona wire connected with negative pulse high voltage and a netty metal electrode connected with positive pulse voltage; the absorption liquid is sprayed on the netty metal electrode to form liquid film; after the PM2.5 particles are charged, the PM2.5 particles move to the liquid film by electrostatic force and are adsorbed and caught by the liquid film; vapor and oxygen of the smoke gas are decomposed into O, OH, O3, HO2 and other oxidative free radicals; SO2 and NO of the smoke gas are oxidized into high valent state substances which are easy to absorb; subsequently, the substances are absorbed by the absorption liquid; and the reacted absorption liquid is crystallized through sensible heat drying of the smoke gas to be treated to generate reclaimable byproducts. The method realizes simultaneous removing of the PM2.5 particles, SO2 and NOx of the smoke gas and recycles the removed byproducts.

The invention provides a continuous preparation method of an herbicide intermediate of 2, 4-dichlorophenol. The method includes the steps of continuously and reversely feeding phenol and chlorine gas in a mass ratio of 1: (1.4-1.5), subjecting fed materials to continuous chlorination reaction through a multistage chlorination tower, enabling reacted liquid materials to flow into a 2, 4-dichlorophenol receiving tank, and recycling the gas with water through a tail gas absorption tower. The continuous preparation method replaces existing batch type mode to prepare the intermediate 2, 4-dichlorophenol of 2, 4-D acid, operation is simple, safety of preparation is controllable, discharge of three wastes is reduced, power consumption is reduced, and unit time output is increased. Simultaneously, the preparation can further improve yield of products, and recycle by-product acid with concentration of 30.5% during the reaction.

The invention discloses a novel technology for efficiently producing furfural and simultaneously recycling by-products including methanoic acid and acetic acid. An impinging stream reactor which is especially suitable for the technology is adopted, fluid mixing is achieved through multiple times of impinging, a good micromixing effect is achieved, mixed liquid flows outside an impinging area in a plug-flow mode, sufficient staying time is provided for materials, cascaded reacting is achieved, and the target conversion rate is achieved through flow channel and liquid flow rate design. According to the technology, the defect that an existing impinging stream reactor cannot achieve the high conversion rate through a single reactor is overcome, the technology procedures are simplified, production cost and equipment investment are reduced, and long-period running of equipment is guaranteed; no waste liquid is drained in the production process, and a green and environment-friendly technology method is achieved.

The invention discloses a method for recycling a by-product 2-ethylacraldehyde from a reaction process of preparing trimethylolpropane by a condensing and hydrogenating method. The method comprises the following steps of: taking the main by-product 2-ethylacraldehyde (EA) generated at a condensation stage of aldol in trimethylolpropane prepared by condensing and hydrogenating method as the raw material; separating and reacting the raw material with formaldehyde under the alkaline condition; and finally, obtaining trimethylolpropane (TMP). According to the invention, more than 90% of the EA can be basically transformed and the selectivity of the generated TMP is more than 90%; the method improves the economic utilization of the raw material and the reaction cost is reduced as well. The method provided by the invention also can directly utilize the commercial grade EA and formaldehyde to react under the alkaline condition so that the EA can be transformed into TMP.

The invention provides a hypoallergenic processing method of dried shrimp floss, which comprises the following steps: the first step is to remove the shrimp shells to collect the shrimp meat, soak the shrimp meat in seasoning liquid, take it out after 30 to 40 minutes and place it in a water-proof steamer. In the pot, spray a layer of seasoning liquid on the surface of the shrimp meat, heat until the water boils and cook for 30-40 minutes to obtain cooked shrimp meat, and spray the seasoning liquid on the surface of the shrimp meat every 10 minutes during the cooking period; the second step is to cook the shrimp meat. The prepared shrimp meat is baked in an oven until 50% dry, taken out and naturally cooled to room temperature, and then shredded along the texture of the meat to obtain minced shrimp meat. Put the minced shrimp meat, minced mushrooms, minced garlic, and minced onion on the Grinding in a cooking machine to obtain a pulverized product; in the third step, putting the pulverized product in a frying pan and frying it dry on low heat to obtain the hypoallergenic shrimp floss. The invention recycles the by-products of pork skin and hoof tendons to make minced skin, which is used as an additive of the meat floss, thereby greatly improving the quality of the meat floss.

The invention discloses a method for recycling by-product hydrochloric acid in methane fluorine compound production. The method comprises the following steps: step one, extracting HF in mixed gas in fluoridation by using concentrated hydrochloric acid of which the mass concentration is 30 to 35 percent; step two, absorbing HCl in the extracted mixed gas through a falling film absorber, thus preparing the by-product hydrochloric acid; step three, carrying out water washing and alkali washing treatment on residual gas, and entering follow-up equipment, thus obtaining a methane fluorine compound. The method disclosed by the invention can be executed under normal temperature and normal pressure, the energy consumption is small, economy and effectiveness are realized, and the purity of the recycled hydrochloric acid is high.

The invention provides a method for preparing byproduct N-benzylphthalimide during the preparation of mono-propargylamine. The method comprises the following steps: reacting N-propinyl-phthalimide with high boiling amine at 160-180 DEG C by using amine salt as catalyst, collecting the fraction at 80-85 DEG C, namely, propargylamine, recycling benzylamine from the reaction solution, and then recycling byproduct N-benzylphthalimide from the obtained solution by recrystallisation. The beneficial effect of the invention is as follows: solvent is not used; the yield is high; and compared with existing methods, the method for recycling by-product N-benzylphthalimide through recrystallisation reduces the cost greatly and decreases the environmental pollution.

The invention relates to a technology for recycling a by-product fluosilicic acid of wet process phosphoric acid. The technology comprises the following steps: washing and absorbing fluorine-containing gas produced in a production process of the wet process phosphoric acid so as to form a fluosilicic acid solution, and then enabling the fluosilicic acid solution and ammonia water to be subjected to a preneutralization reaction so as to generate an ammonium fluosilicate solution; primarily mixing the ammonium fluosilicate solution with the wet process phosphoric acid to obtain mixed acid liquor; then, secondarily mixing the mixed acid liquor with potassium hydrogen sulfate to obtain compound fertilizer mixed acid slurry; enabling the compound fertilizer mixed acid slurry and gaseous ammonia to be subjected to a neutralization reaction to obtain compound fertilizer neutralized slurry; or enabling the mixed acid liquor and the gaseous ammonia to be subjected to a neutralization reaction to obtain ammonium phosphate neutralized slurry, and concentrating the ammonium phosphate neutralized slurry to obtain concentrated slurry; carrying out slurry-spraying granulation on the compound fertilizer neutralized slurry or the concentrated slurry, drying, screening and enveloping to obtain sulfur-based compound fertilizer or ammonium phosphate. The technology reduces the volatilization of the fluorine-containing gas of the fluosilicic acid solution, reduces the corrosivity of the solution, reduces pollutant emission and improves the ecological environment.