53results about How to "Reduce the difficulty of production operations" patented technology

The invention discloses a preparation method of grosvenor momordica glycoside V with high purity, which has steps as follows: 1) the grosvenor momordica glycoside is dissolved in methanol and then filtered to obtain a filtrate; 2) acetone is added in the obtained filtrate for sedimentation and a sediment can be obtained by filtering; 3) the sediment is adsorbed by a normal phase silica gel column; 4) the adsorbed normal phase silica gel column is eluted by using a mixing solution of low carbon chain ester and ethanol as an elution agent, and elution liquid is collected; and 5) the grosvenor momordica glycoside V with high purity can be obtained by recycling and crystallizing the elution agent in the elution liquid. Compared with the prior art of twice column adsorbing methods of the normal phase silica gel column and expensive opposite phase silica gel column, the preparation method only needs separation and elution of the normal phase silica gel column once to obtain the grosvenor momordica glycoside V with good quality and purity of more than 98 percent. Compared with the prior art, the preparation method of the grosvenor momordica glycoside V with high purity is simpler in technique, shortens the production cycle and reduces the production operation difficulties and production cost.

A 400 MPa-grade fine-grain hot rolled steel bar and a manufacturing process therefor, which relate to the field of hot-rolled steel bar production. The steel bar comprises the following components in mass percentage: 0.20-0.25% of C, 0.3-0.8% of Si, 1.2-1.6% of Mn, 0.01-0.04% of P, 0.01-0.04% of S, 0.005-0.03% of Ti, 0.001-0.08% of Cr, 0.0001-0.008% of V, 0.0001-0.008% of Nb, 0.0001-0.008% of Al, 0.01-0.02% of O, and 0.003-0.01% of N, the rest being Fe and inevitable impurities. The described steel bar further comprises manganese silicate inclusions, titanium oxide manganese sulfide multiphase inclusions, manganese sulfide inclusions and other inevitable inclusions. The manufacturing process comprises: molten steel smelting, continuous casting, continuous cast billet heating and steel bar rolling. According to the described method, by combining the optimization of the components and inclusions with smelting, continuous casting and rolling improvement as well as an inclusion induced fine grain strengthening mechanism, the strength of the steel bar is improved, the amount of precious alloy elements added is reduced, and the low-cost and high-quality production of a hot-rolled steel bar is achieved.

The invention relates to a method for preparing high-purity dimethyl ether free from extraneous odour, which has the following steps: 1.pretreating methanol, the raw material, adjusting pH value thereof to 7-8; 2. evaporating the preheated methanol to obtain methanol vapour, then carrying out gas-phase catalytic dehydration to obtain dimethyl ether; 3.rectifying dimethyl ether; 4. washing the rectified dimethyl ether with alkaline solution. In the invention, with methanol made from coal as the raw material, high-purity dimethyl ether free from extraneous odour can be produced at relatively low cost.

The invention discloses a method for extracting fructus momordicae sweet glycoside. The extraction method comprises the following steps: crushing fructus momordicae, extraction, absorbing the extraction liquid through a macroscopic absorbent resin, eluting the resin, collecting the eluent, and concentrating and drying the eluent; wherein the macroscopic absorbent resin can be an ADS-21, ADS-17, ADS-7 or an ADS-F8 macroscopic absorbent resin with strong polarity. Compared with the multiple column absorption method in the prior art in which extracting solution passes through an absorbent resin first and then passes through a decolorization resin and / or a deodorization resin, a decolored and deodorized fructus momordicae sweet glycoside product can be obtained only through one-time absorption separation carried out by the macroscopic absorbent resin with strong polarity without the decolorization and deodorization processes according to the method. The color of the prepared fructus momordicae sweet glycoside is white or similarly white which is different from the russet and pale yellow color of the prior fructus momordicae sweet glycoside. In addition, the sweetness of the fructus momordicae sweet glycoside is pure without bitterness or a traditional Chinese medicine taste, wherein the weight content of fructus momordicae gypenosides reaches as high as more than 95 percent, and the weight content of fructus momordicae sweet glycoside V reaches more than 65 percent.

The invention provides a dissolving-out process for a large-sized pipeline remaining tank of diasporite bauxite ore. Processed raw materials include gibbsite and boehmite mixed bauxite ore or the diasporite bauxite ore. The dissolving-out process includes the following steps: pre-desiliconized ore pulp is mixed with circulating mother liquor at an outlet of a desiliconizing discharging groove, ispreheated by a sleeve preheater, is heated to the dissolving-out temperature by a sleeve heater, and then enters a heat-preservation remaining tank for remaining; finally, flash evaporation and separation are carried out on the ore pulp by a flash evaporator. The method in the invention realizes maximization of equipment, has strong capability of processing the ore pulp, and breaks through the capability limit of a pressing and stewing dissolving-out process to process the ore pulp; moreover, energy is saved, and the heat utilizing rate is high. The multi-inner-pipe sleeve preheater and the heater are adopted to preheat and heat the bauxite ore pulp; within the operating temperature range of the process, the heat transfer coefficient can be up to 900 to 1,200 Kcal / m2.h. DEG C. Compared with the traditional dissolving-out process, the dissolving-out process in the invention can save more than 30% of the energy in a comprehensive manner.

The present invention relates to a fracturing pump plug displacement detection device and its detection method, which includes a liquid cylinder (1), a plug (2), a detection device (4), and a control system (5), the plug ( 2) Set on the liquid cylinder (1), the detection device (4) is installed on the liquid cylinder (1), the detection device (4) is connected with the control system (5), and the detection device (4) sends the signal to Control system (5); when the plug (2) moves beyond the normal range and the detection device (4) is in an abnormal detection state, the control system (5) executes the action of stopping operation or sends out an alarm signal; the detection method uses the detection device to carry out Fracturing pump plug displacement detection. The invention has the advantages of simple and convenient operation, accurate detection results, timely and effective maintenance, and greatly improves the safety during the operation of the fracturing pump.