598results about How to "The reaction process is simple" patented technology

The invention discloses multipolymer micro-nano particles and a preparation method thereof. The multipolymer micro-nano particles are prepared from styrene monomers, maleic anhydride monomers and (methyl) acrylate monomers; the multipolymer micro-nano particles are prepared in a self-stabilizing precipitation polymerization manner, and a copolymerization reaction system comprises styrene electron donor monomers, maleic anhydride electron receptor monomers and (methyl) acrylate monomers; narrow-range multipolymer micro-nano particles are separated from the reaction system through centrifugation or filtration after the polymerization reaction ends. The method adopts a simple synthesis route and mild reaction process condition and is safe and convenient to operate, the processability and water resistance of the prepared multipolymer micro-nano particles are significantly improved beside uniform particle size distribution, and the multipolymer micro-nano particles are applicable to industrial production of polymer micro-nano particles.

The invention relates to a controlling and resource recovering method for waste water in tobias acid production, adjusting the pH of the waste water and filtering, and making main organic matters in the waste water absorbed on resins by macroporous weakly basic resin and super-high cross-linking absorbing resin combination. And before processing, the waste water is puce, chroma of the waste water is 45000-5000mg / L, sulphonated tobias acid concentration of the waste water is 12000-15000mg / L, tobias acid and 2, 1-acid concentration of the e waste water is 6000-7000mg / L, COD concentration of the waste water is 45000-50000mg / Lú¼and after processing, the chroma is 10-50, sulphonated tobias acid concentration <500mg / L, the TuShi acid and 2, 1-acid concentration<50mg / L, and CODcr<1500mg / L. And the resins regenerate by de-absorption of liquid alkali and water. High concentration de-absorbing liquor returns to the aminating operation segment in the tobias acid producing process and low concentration de-absorbing liquor is used in the next de-absorbing operation.

The invention relates to a new method for preparing LixFeyPzO4 (particularly LiFePO4, LiFe2 / 3PO4 and Li4 / 7Fe4 / 7P8 / 7O4) by using ferro phosphorus, which comprises the following steps of: supplying an oxygen source for oxidizing P in the ferro phosphorus by only utilizing the oxygen in raw materials, proportioning in the mol ratio of the total phosphorus element to the total oxygen element of 1.0:(1.5-9.0), mixing the raw materials and then carrying out one-step reaction in a closed system at the temperature of 500-900 DEG C to obtain a product. The oxidation-reduction reacted material balance of the raw materials per se is realized in the closed system, without external oxygen sources, thereby solving a series of technical difficult problems caused by difficult oxygen quantity accurate control and oxygen introduction and eliminating the pollution of a large amount of waste gas during roasting by adopting an inert atmosphere or a carbide split product reducing atmosphere; the reaction is finished in the closed system, and the complete reaction is promoted by utilizing the pressure of the reaction per se, thereby reducing the volatilization of substances, such as lithium and the like in the raw materials, at high temperature and causing the product to be looser; and the method has no pollutant discharge in the preparation process, cleanness, environmental protection, short reaction flow, simple process, easy reaction operation, low requirement for equipment, low cost, less investment and good benefit and is easy to realize industrialization and suitable for producing high-performance LixFeyPzO4 by using the ferro phosphorus with low cost.

The invention relates to a catalyst for preparing acrylic acid from lactic acid dehydration and a reaction technology thereof. The catalyst comprises an inorganic porous material vector and an active metal component with 1wt% to 50wt% (calculated in the form of oxide), wherein, the inorganic porous material vector is one of silica-aluminum molecular sieve, phosphorous-aluminum molecular sieve, silica-phosphorous-aluminum molecular sieve and mesoporous material, and the active metal component is one of or a plurality of materials combined according to the random ratio such as IA, IIA, IIB, VIB, VIIB, VIIIB and rare earth elements. The catalyst is prepared in a way that the inorganic porous material vector is impregnated and loaded into the solution of soluble salt or hydroxide which contains active metal. The reaction of preparing acrylic acid from lactic acid dehydration is carried out in a fixed-bed flow-typed reactor which is filled with the catalyst; lactic acid which has 10-100% of concentration is directly put into the reactor to carry out catalytic dehydration at 280 DEG C to 400 DEG C without preheating gasification, so as to obtain 100% of lactic acid conversion rate and over 63% of acrylic acid selectivity.

The invention discloses a water-based polyurethane dispersion for color fixation, and a preparation method and application thereof. The preparation method of the water-based polyurethane dispersion for color fixation comprises the following steps: 1, performing polymerization reaction on polyisocyanate, low polymer polylol and small molecule diol to obtain a polyurethane prepolymer; 2, performing crosslinking reaction on the polyurethane prepolymer and crosslinking agent in solvent to obtain crosslinked polyurethane; 3, performing dispersion and emulsification on the crosslinked polyurethane and deionized water to obtain a crosslinked polyurethane dispersion; 4, performing chain extension reaction on the crosslinked polyurethane dispersion and diamine to obtain chain-extended crosslinked polyurethane; and 5, performing termination reaction on the chain-extended crosslinked polyurethane and amino-terminated silane coupling agent to obtain the water-based polyurethane dispersion for color fixation. The preparation method disclosed by the invention is simple in process and low in energy consumption; and the prepared product has favorable film forming property and favorable color fixation property, and is suitable for industrial production.

The invention relates to a one-step preparation method for tetrahydrofuran, the method comprises the following steps: taking maleic anhydride as a raw material, under the condition of a hydrogenation-dehydration bifunctional catalyst, carrying out a maleic anhydride hydrogenation preparation to obtain tetrahydrofuran, the hydrogenation-dehydration bifunctional catalyst is CuO-ZnO / solid acid, wherein the solid acid is ZSM-5, beta or Y, SAPO-11 molecular sieve, gamma-Al2O3 and the like; the invention also provides an application of the ydrogenation-dehydration bifunctional catalyst in above reaction. The method of the invention has the advantages of complete conversion rate of maleic anhydride, high selectivity of tetrahydrofuran, simple reaction process and the like.