4 results about "Contact time" patented technology

The invention discloses a coproduction method of 1, 2-propanediamine and dimethyl piperazine, which comprises the following steps of: mixing ammonia and isopropanol amine, pre-heating for vaporization, filling steam into a fixed-bed reactor, performing reaction in the presence of a catalyst for condensation and amination and under conditions with the pressure of 1.0MPa to 4.0MPa, the temperature of 300 DEG C to 350 DEG C and the contact time of 1.0-3.0s to obtain product stream of 1, 2-propanediamine, 2, 5-dimethyl piperazine, 2, 6-dimethyl piperazine, unreacted ammonia and unreacted isopropanol amine, and distilling the product stream for separation to obtain the 1, 2-propanediamine, 2, 5-dimethyl piperazine and 2, 6-dimethyl piperazine; wherein the weight ratio of the ammonia and the isopropanol amin is (10-16):1, and the catalyst for condensation and amination comprises the following ingredients by weight percentage: 97-99 percent of HZSM-5 (H-type zeolite sieve of molecular porosity 5) zeolite and 1-3 percent of phosphorus. The coproduction method is mainly applied in preparation of the 1, 2-propanediamine and the dimethyl piperazine.

The invention relates to screw rod type impregnation equipment which comprises an impregnation sleeve, an impregnation shaft arranged inside the impregnation sleeve in a sleeving manner, and a glue injection hole, a tows inlet and a tows outlet which are formed in the same side of the impregnation sleeve, wherein the tows inlet and the tows outlet are respectively positioned in the left and right ends of the impregnation sleeve; the impregnation shaft is a screw rod type impregnation shaft; the threaded length of the impregnation shaft is smaller than the length of the impregnation sleeve; glue solution is poured from the glue injection hole, the sizes of the tows inlet and the tows outlet can be adjusted by virtue of an adjusting block and a fastening bolt, the condition that net one strand of tows enters the impregnation sleeve is ensured by adjusting the size of the tows inlet, and the glue content of fibers separated from the impregnation sleeve after impregnation is controlled by adjusting the size of the tows outlet. The screw rod type impregnation equipment disclosed by the invention is closed impregnation equipment, the glue solution is not contacted with outer atmosphere, and pollution is avoided; screw rod type impregnation is adopted, the tows totally enter the glue solution, the contact time with the glue solution is long, full impregnation is realized, and the impregnation effect is good.

The invention provides a washing device and a washing method for an extractor hood and belongs to the field of household appliances. The extractor hood comprises a volute, a wind wheel installed in the volute and a motor used for driving the wind wheel to rotate. The washing method comprises the steps that a cleaning solution is fed into the volute; the liquid level of the cleaning solution on thebottom of the volute is detected; whether the liquid level reaches a preset liquid level or not is judged; under the situation that it is judged that the liquid level reaches the preset liquid level,the wind wheel is controlled to rotate for a first preset duration and/or a first preset number of turns in an intermittent manner in the first rotating direction; and the wind wheel is controlled torotate for a second preset duration in an intermittent manner in the second rotating direction opposite to the first rotating direction. By means of the technical scheme, in the washing process of the extractor hood, the sustained contact time of the cleaning solution and blades of the wind wheel is longer, and a better washing effect can be achieved.

The invention relates to a display device, in particular to a cosmetic display device. Thus, the cosmetic display device aims at achieving the technical purposes that foundation make-up can be prevented from going moldy or deteriorating. According to the technical scheme, the cosmetic display device comprises a transparent box body, landing legs, a vertical rod, a transparent cover plate, a torsional spring, a sliding rod, a sliding sleeve, a transparent frame body, a weight block, a fulcrum rod, a roller, a drum, a guide sleeve and the like. The landing legs are connected to the left side andthe right side of the bottom of the transparent box body, an opening is formed in the top of the transparent box body, the left side of the inner bottom of the transparent box body is connected withthe vertical rod, the top end of the vertical rod is rotationally connected with the transparent cover plate, and the torsional spring is arranged at the joint of the transparent cover plate and the vertical rod. By means of the transparent cover plate and a rubber cushion, the transparent frame body can be sealed, and therefore it can be avoided that the foundation make-up goes moldy or deteriorate as the contact time of the foundation make-up and air is too long; the guide rod can be fixed through a clamping mechanism, a customer can put down a push handle, and therefore the customer can more conveniently try out the foundation make-up.