Abstract
1, 4-Butanediol (BDO) is an important organic and fine chemical raw material, but the waste liquid (BDO tar) discoal charged from the BDO production plant is complex in composition, contains salt, and is complicated to handle. In this study, BDO tar was treated by the method of waste-coal water slurry, and the gasification process of blending BDO tar was studied. The results show that as the BDO tar content increases, the organic component in the BDO tar causes the temperature point corresponding to the peak of the maximum reaction rate to migrate to the high temperature zone during the initial temperature to 150 °C. In the temperature range of 200 °C~300 °C, the weight loss of BDO tar leads to a significant weight loss peak of TG curves. From 600 °C to the final reaction temperature range, the alkali metal Na enriches the surface of the coal char with more active “spot”, and due to the alkali metal Na limits the graphitization of coal char, the active sites increase, which increases the coal char gasification reaction activity.
Highlights
1.1 BDO tar BDO is an important commodity chemical that is widely used in industry for production of plastics, elastic fibers and pharmaceuticals [1]
To further illustrate the effect of blending BDO tar on the performance of coal water slurry gasification, the ZK coal was subjected to acid elution ash and loaded with alkali metal Na
Around 150 °C, the DTG curves migrates to the high temperature zone at the position of the weight loss peak with the increase of the BDO tar, which is caused by the volatilization of the low boiling point substance in the BDO tar sample; At the range of 200 °C~300 °C, the maximum weight loss rate increased with the increase of tar blending amount, which is mainly caused by the higher boiling point substance in the BDO tar sample
Summary
1.1 BDO tar BDO is an important commodity chemical that is widely used in industry for production of plastics, elastic fibers and pharmaceuticals [1]. The main production processes of BDO are: Reppe method, n-butane/ maleic anhydride method, allyl alcohol method and butadiene method [4]. The main production process of BDO is the Reppe method. In the purification process of product BDO, BDO is refined by using a wiped film evaporator. A certain amount of viscous and difficult-to-volatile distillation substrate (BDO tar) is usually formed in the evaporator, and the substrate is dark brown and viscous, with high viscosity and complex composition. The method of handling BDO tar is complicated. The factory uses incineration to treat it, which has a certain impact on the environment [5]. The waste coal-water slurry technology developed on the basis of traditional resources can effectively reduce the waste disposal problem and is a better way to protect the environment
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