A method for controlling water content of propylene product in coal-based methanol-to-propylene process
A technology for producing propylene and product water from methanol, which is applied in the direction of producing hydrocarbons from oxygen-containing organic compounds, organic chemistry, etc., can solve the problems of reduced water absorption capacity of molecular sieves, affecting water absorption effect, and difficult to completely regenerate, and achieves easy process improvement and water solution. The effect of excessive content and low cost of device modification
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Embodiment 1-4
[0033] According to the oxide index at the outlet of the oxide extraction tower, adjust the feed water volume of the oxide extraction tower, and as shown in Table 1, control the liquid level of the extraction tower. The content of dimethyl ether in the liquid phase of the oxide extraction tower is 0.248wt%, and the content of methanol is 0.005wt%; the content of dimethyl ether in the gas phase is 0.312wt%, and the content of methanol is 0.009wt%. At this time, the control material feed rate is 63.80% of the column capacity. As shown in Table 1, adjust the interface gauge and liquid level gauge range of the oxide extraction tower, and adjust the liquid level control height to reduce the water content entrained at the top outlet of the tower. A Karl Fischer instrument (model DL-31, Mettler-Toledo, USA) is installed at the inlet of the oxide extraction tower and the outlet of the oxide extraction tower to measure the trace amount of water contained in the hydrocarbon products.
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Embodiment 5-9
[0037] Modification of the oxide extraction tower, adding liquid collection devices, such as coalescers or / and dehydration tanks. See Table 2 for details of the process modification. Among them, the coalescer used is Beijing Zhaohua Xianquan Technology Development Co., Ltd., and the model is BZTC-JJX-150×1500. The manufacturer of the dehydration tank is Beijing Zhaohua Xianquan Technology Development Co., Ltd., 2400mm, capacity 34m 3 .
[0038] Table 2
[0039]
Embodiment 10
[0041] Add a dehydration tank after the outlet of the oxide extraction tower and in the front section of the dryer.
[0042] table 3
[0043]
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