31results about "Stannous chloride" patented technology

The present disclosure provides a catalyst for preparing lactic acid and derivatives thereof, comprising at least one of metallic compounds MXn, wherein M is selected from Na, K, Mg, Ca, Sr, Ba, Al, Ga, In, Sn, Sb, Bi, Cr, Mn, Fe, Co, Ni and Zn, and n is an integer of 1 to 6. The present disclosure further provides a method for synthesis of lactic acid and derivatives thereof, wherein at least one raw material including carbohydrates, at least one alcohol, at least one of the aforesaid catalysts and at least one solvent are heated to react to prepare lactic acid and derivatives thereof.

The invention relates to a dynamic crystallization technological method and device for a stannous chloride solution. The technological method comprises the following steps of: A, adding a stannous chloride concentrated solution into rotation equipment with a clamping sleeve; B, introducing a coolant into the clamping sleeve of the rotation equipment; C, starting the rotation equipment, controlling the rotation speed of the rotation equipment to be 2-5r / min, and controlling the temperature difference between the stannous chloride concentrated solution and the coolant in the whole crystallizingprocess to be 5-10 DEG C, and D, ending crystallization when the concentration temperature T of stannous chloride is not more than 10 DEG C, stopping introduction of the coolant and the rotation equipment, spinning to dry slurry crystal in the rotation equipment in a centrifuger, and packaging to obtain a product of the stannous chloride. In the invention, the traditional static crystallization mode of the stannous chloride solution is changed into a dynamic crystallization mode, and the advantages of improved production efficiency, high crystallization rate, uniform particle sizes of stannous chloride crystals and simplified crystallization production process are achieved.

The invention discloses a preparation method of premium-grade stannous chloride from low-tin waste residues. The invention comprises the following steps: preparing a reaction solution, introducing chlorine, settling, settling for a second time, filtrating, concentrating, freeze crystallization and solid-liquid separation, wherein the obtained solid is the premium-grade stannous chloride. According to the invention, low-tin waste residues produced in tin manufacturing process are used as raw materials, various indexes of the stannous chloride product are controlled through acidity, concentration and time, and multiple setting, filtering and concentrating are performed to remove impurities, so as to obtain premium-grade stannous chloride products. The preparation method disclosed by the invention is simple in process, low in cost and environmentally friendly, provides a new way for recycling of low-tin waste residues produced in a tin manufacturing process and satisfies requirements of circular economy.

The invention relates to a chlorine introducing method and a chlorine introducing device, in particular to a chlorine introducing method and a chlorine introducing device for producing stannous chloride by liquid chlorine. The method comprises the following steps of: introducing liquid chlorine into a coiled tube to be heated and gasified, introducing chlorine to a chlorine introducing tank for use, and heating the coiled tube by external hot water at the temperature of between 40 and 60 DEG C. The device comprises a liquid chlorine cylinder, the toiled tube, a heating water tank and a chlorine buffer tank, wherein the coiled tube is arranged in the heating water tank; an inlet of the coiled tube is communicated with the liquid chlorine cylinder, and an outlet of the coiled tube is communicated with the chlorine buffer tank; and the chlorine buffer tank is communicated to the chlorine introducing tank. In the method and the device, an operating mode of the natural gasification of the liquid chlorine is changed, and the liquid chlorine is introduced into the coiled tube in liquid mode and is heated by utilizing the coiled tube to accelerate the gasification speed of the liquid chlorine and improve the efficiency of a chlorination reaction in stannous chloride production; and the requirement of the production on the speed of a chlorine introducing reaction can be met only by opening one cylinder of liquid chlorine (one ton / cylinder), and the reliability of safety performance of the liquid chlorine during use is enhanced.