阅读说明：本技术 一种乙烯法生产醋酸乙烯酯中提纯醋酸的装置 (Device for purifying acetic acid in vinyl acetate production by ethylene method ) 是由 任国瑜 任佳乐 黄志伟 王宝强 王金玺 刘树繁 曹曈斌 宋紫薇 于 2019-11-20 设计创作，主要内容包括：一种乙烯法生产醋酸乙烯酯中提纯醋酸的装置,包括醋酸精馏塔塔顶冷凝器、醋酸精馏塔、换热器与气液分离罐,醋酸精馏塔的顶部出口经压缩机与换热器顶部入口相连,换热器底部出口与醋酸精馏塔塔顶冷凝器底部入口相连,醋酸精馏塔塔顶冷凝器的顶部出口与醋酸精馏塔相连；醋酸精馏塔的底部出口与换热器的侧壁入口相连,换热器的侧壁出口与气液分离罐的入口相连,气液分离罐的顶部出口与醋酸精馏塔的回流入口相连。本发明中通过设置换热器,提升了传热效果,有效的降低了塔底再沸器的能耗,提高了能量利用率。通过在换热器内设置扰流平板内构件,增大了传热效率,提升了能量的利用率。(A device for purifying acetic acid in vinyl acetate production by an ethylene method comprises an acetic acid rectifying tower top condenser, an acetic acid rectifying tower, a heat exchanger and a gas-liquid separation tank, wherein a top outlet of the acetic acid rectifying tower is connected with a top inlet of the heat exchanger through a compressor, a bottom outlet of the heat exchanger is connected with a bottom inlet of the acetic acid rectifying tower top condenser, and a top outlet of the acetic acid rectifying tower top condenser is connected with the acetic acid rectifying tower; the bottom outlet of the acetic acid rectifying tower is connected with the side wall inlet of the heat exchanger, the side wall outlet of the heat exchanger is connected with the inlet of the gas-liquid separation tank, and the top outlet of the gas-liquid separation tank is connected with the reflux inlet of the acetic acid rectifying tower. By arranging the heat exchanger, the heat transfer effect is improved, the energy consumption of the tower bottom reboiler is effectively reduced, and the energy utilization rate is improved. Through set up the dull and stereotyped internals of vortex in the heat exchanger, increased heat transfer efficiency, promoted the utilization ratio of energy.)

1. A device for purifying acetic acid in vinyl acetate production by an ethylene method is characterized by comprising a condenser (41) at the top of an acetic acid rectifying tower, the acetic acid rectifying tower (32), a heat exchanger (36) and a gas-liquid separation tank (37), wherein the outlet at the top of the acetic acid rectifying tower (32) is connected with the inlet at the top of the heat exchanger (36) through a compressor (35), the outlet at the bottom of the heat exchanger (36) is connected with the inlet at the bottom of the condenser (41) at the top of the acetic acid rectifying tower, and the outlet at the top of the condenser (41) at the top of the acetic acid rectifying tower is connected with the acetic acid rectifying tower (32);

the bottom outlet of the acetic acid rectifying tower (32) is connected with the side wall inlet of the heat exchanger (36), the side wall outlet of the heat exchanger (36) is connected with the inlet of the gas-liquid separation tank (37), and the top outlet of the gas-liquid separation tank (37) is connected with the reflux inlet of the acetic acid rectifying tower (32).

2. The apparatus for purifying acetic acid in the production of vinyl acetate by the ethylene process according to claim 1, wherein the heat exchanger (36) is a tubular heat exchanger.

3. The device for purifying acetic acid in the vinyl acetate production by the ethylene method according to claim 1 or 2, characterized in that the heat exchanger (36) comprises a cylinder body, and sealing heads are arranged at two ends of the cylinder body; the total length of the heat exchanger (36) is 5.5 meters, the total length of the cylinder is 4.4 meters, and the diameter of the cylinder is 0.5 meter.

4. The apparatus for purifying acetic acid in vinyl acetate production by ethylene process according to claim 1, wherein the barrel of the heat exchanger (36) comprises a shell side and a tube side, the bottom of the acetic acid rectifying tower (32) is connected with the shell side inlet of the heat exchanger, and the shell side outlet of the heat exchanger is connected with the gas-liquid separator (37);

the top of the acetic acid rectifying tower (32) is connected with an inlet of a compressor (25), an outlet of the compressor (25) is connected with a tube pass inlet of a heat exchanger (36), and a tube pass outlet of the heat exchanger is connected with a condenser (41).

5. An apparatus for purifying acetic acid in the production of vinyl acetate by ethylene process according to claim 1, characterized in that a plurality of flow-disturbing three-blade type internals (1) are installed in the tube side.

6. An apparatus for purifying acetic acid in vinyl acetate production by ethylene process according to claim 5, characterized in that the three-bladed flow disturbing internal member (1) comprises a sleeve on which 3 blades are uniformly arranged.

7. The apparatus for purifying acetic acid in the ethylene process of producing vinyl acetate as claimed in claim 6, wherein the tube pass is provided with a support bar, the support bar is sleeved with a plurality of flow-disturbing three-blade type internals (1), and the plurality of flow-disturbing three-blade type internals (1) can rotate under the impact of the fluid.

8. The apparatus for purifying acetic acid in the production of vinyl acetate by the ethylene process according to claim 6, characterized in that the inlet and the outlet of the heat exchanger (36) are provided with auxiliary heat exchangers.

9. The device for purifying acetic acid in vinyl acetate production by the ethylene method according to claim 1, characterized in that the bottom outlet of the acetic acid rectifying tower (32) is connected with the side wall inlet of the heat exchanger (36) through a tower bottom discharge pump (39) of the acetic acid rectifying tower; the bottom outlet of the gas-liquid separation tank (37) is connected with a pipeline, and a tower kettle outlet flow control valve (38) is arranged on the pipeline; the bottom outlet of the heat exchanger (36) is connected with the inlet at the bottom of a condenser (41) at the top of the acetic acid rectifying tower through a heat exchanger outlet connection stop valve (40); the top outlet of the condenser (41) at the top of the acetic acid rectifying tower is divided into two paths, one path is connected with the acetic acid rectifying tower (32) through a reflux quantity control valve (34) at the top outlet of the first acetic acid rectifying tower, and the other path is provided with a flow control valve (33) at the top outlet of the second acetic acid rectifying tower.

10. The apparatus for purifying acetic acid in vinyl acetate production by ethylene process according to claim 1, wherein the acetic acid rectifying tower (32) is a plate rectifying tower, and the total number of actual plates in the acetic acid rectifying tower (32) is 30-42;

the total height of the plate type rectifying tower is 26 meters, the diameter of the tower is 1.2 meters, a sieve plate tower is arranged inside the plate type rectifying tower, the diameter of an inner hole of the tower is 12.7 millimeters, the width of a side wall downcomer inside the plate type rectifying tower is 0.78 meter, the height of an internal weir of the plate type rectifying tower is 70 millimeters, and the distance between tower plates is 0.8 meter; the acetic acid rectifying tower (32) is internally provided with a high-temperature polytetrafluoroethylene lining.