Evaporator for solid-liquid separation

Abstract

The invention discloses an evaporator for solid-liquid separation, which comprises an upper seal head, an upper cylinder body, a conical cylinder and a bottom cover which are sequentially connected from top to bottom, and is characterized in that: the inner diameter of the upper cylinder body is far more than that of the bottom cover so as to form a shape with a big upper part and a small lower part; the conical cylinder and the bottom cover are connected by a quick opening locking device; a bottom outlet is positioned in the middle of the bottom cover; and a nitrogen inlet is positioned at the bottom of one side of the conical cylinder. The quick opening locking device adopts a hoop structure consisting of two semi-circular collars, which connects the conical cylinder with a flange in a hooping way. The evaporator has the advantages that: because the cylinder body is provided with the big upper part and the small lower part in volume, residual liquid is prevented from being quickly evaporated to dryness and coking; the evaporating degree is easily controlled; light components are fully reclaimed; because nitrogen is charged to pressurize and the quick opening locking device is adopted, the shortcoming of slow discharging of thick residual liquid is overcome; before the quick opening locking device is opened every time, the nitrogen is used for fully replacing air in a kettle,so the operation is safe and sanitary; and because the bottom cover adopts a hydraulic lifting platform, solid residual dregs are convenient to clear.

Description

technical field [0001] The invention relates to a chemical equipment, in particular to an evaporator used for solid-liquid separation of coke-prone viscous solids. Background technique [0002] The preparation of isopropenyl acetate is generally obtained by the reaction of acetone absorbing ketene under the action of a catalyst. In the absorption liquid, in addition to the product isopropenyl acetate and incompletely reacted acetone, there are catalysts and a small amount of resinous compounds. The current process generally adopts the method of flash evaporation to distill light components such as isopropenyl acetate and acetone, and the remaining viscous solids are mainly composed of catalysts and resinous compounds, which are discharged from the bottom of the kettle. Generally, a flash kettle is used to completely evaporate the light components. The viscous solid has high viscosity, poor fluidity, and is not easy to discharge. Especially in the case of excessive evaporatio...

AI Technical Summary

Problems solved by technology

This puts forward very high requirements on the evaporation end point: if the evaporation end point is at the front, the product isopropenyl acetate will remain in a large amount in the residue, and the high value-added isopropenyl acetate product will be lost, which will increase the unit consumption; if the evaporation end point is behind, The residue is solidified or even coked, which is difficult to discharge and affects normal production

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