38results about How to "Narrow residence time distribution" patented technology

The invention discloses a same-direction self-cleaned twin-screw extruder with baffle plates and a processing method thereof. A screw mechanism of the same-direction self-cleaned twin-screw extruder comprises a first screw rod and a second screw rod, wherein the first screw rod is in a single thread structure, and the second screw rod is in a double thread structure; the baffle plates are arranged in the screw grooves of the first screw rod, and the height of each baffle plate is less than the depth of each screw groove of the fist screw rod; 8-shaped hyperbolic flow disturbance can be formed at the baffle plates in the screw grooves of the first screw rod; and the first screw rod and the second screw rod rotate at the same speed, are meshed with each other at all times and are self-cleaned simultaneously. According to the processing method, the screw grooves are triggered under the action of 8-shaped hyperbolic flow disturbance formed due to the arrangement of the baffle plates to mix materials chaotically all the way, two flowing ways formed by the two screw rods fulfill the topological chaotic mixing function of dividing materials into two parts, mixing the two parts of materials and dividing the mixture into two parts, and the first screw rod and the second screw rod fulfill the functions of compressing, expanding, recompressing and reexpanding periodically. Under the joint action of three reinforced mixing mechanisms, the materials can be molten and mixed efficiently.

An extruder screw (10) for a screw extruder (1) is disclosed having a central shaft (18) and a number of screw flights (20) arranged upon the central shaft (18). At least one of the screw flights (20) includes at least one discontinuity (38) which is an interruption in the screw flight (20) by which a portion of said screw flight (38) is offset circumferentially from the remainder of the screw flight (38). Also disclosed is a screw extruder (1) including a screw (10) having at least one discontinuity (38), a method of cooling material in a screw extruder (1), and a method of extruding material from a screw extruder (1) while cooling material within the screw extruder (1).

The invention discloses a catalytic rectification plate tower capable of replacing catalysts on-line, which comprises a tray, a plurality of gas-liquid contact elements arranged on the tray, a plurality of suspended downcomers, and a suspended The liquid receiving tray and the catalyst loading and unloading hole for loading and unloading the catalyst on the tray, the free space surrounded by the suspended downcomer, the gas-liquid contact element, the tray and the tower wall is the catalyst loading area, and the catalyst is scattered in the In the catalyst loading area, the suspended downcomer includes an inner downcomer passing through the tray and an outer guide cover covering the part of the inner downcomer above the bottom of the tray. The tray does not need to carry out complex packaging of the catalyst, but directly packs the catalyst in bulk on the tray, and the online catalyst replacement can be realized without stopping the device, the catalyst is evenly distributed, the tray pressure is reduced, and the rectification efficiency is high. At the same time, expensive catalyst packaging materials and fillers are omitted, and the cost can be significantly reduced.

Disclosed is a continuous manufacturing method for the synthesis of hydazo dicarbonamide. The method comprises: (1) adding hydrazine hydrate and a urea solution into an oscillating flow tube crystallizer via the mid-lower section thereof, producing via reaction hydazo dicarbonamide particles; (2) with the progression of the reaction and the crystallization process, the hydazo dicarbonamide particles grow in diameter and settle towards the bottom of the tube crystallizer, continuously discharging the hydazo dicarbonamide particles settled at the bottom of the tube crystallizer, and acquiring the hydazo dicarbonamide via solid-liquid separation and washing; (3) continuously discharging a pregnant solution containing unconverted reactants from the upper part of the tube crystallizer, and continuously discharging a byproduct, ammonia, from the top part of the tube crystallizer. Also disclosed is the oscillating flow tube crystallizer for use in implementing the manufacturing method.