Wax oil hydrotreating method for diesel oil by-production

Abstract

The present invention relates to a wax oil hydrotreating method for diesel oil by-production. According to the method, under a hydrogenation condition, a biological oil and circulation hydrogen are mixed, and pass through a first stage hydrogenation reaction zone, the stream generated from hydrogenation is separated to obtain hydrogen-rich gas, the hydrogen-rich gas is adopted as second stage supply hydrogen to be used, the separated liquid and the wax oil raw material oil are mixed and enter a second stage wax oil hydrotreating reaction zone, the sub-hydrogen separated from the oil generated through second stage hydrogenation is recycled at the second stage, and the separated liquid product is subjected to fractionation to obtain naphtha, high quality diesel oil and hydrogenation wax oil, wherein hydrogenation activity components of the hydrogenation catalyst used at the first stage are one or a plurality of materials selected from sulfurization state W, Mo, Ni and Co under a reaction state. Compared to the method in the prior art, the wax oil hydrotreating method of the present invention has the following characteristics that: the high quality diesel oil can be by-produced on the wax oil hydrotreating device, activity stability of the catalyst is good, and the device can stably operate for a long period.

Description

technical field [0001] The invention relates to a hydrogenation method, in particular to a wax oil hydrogenation treatment method for by-product high-quality diesel oil. Background technique [0002] At present, the energy on a global scale mainly comes from fossil energy, among which petroleum is the most important source of motor fuel. Petroleum is a non-renewable energy source. Not only are the resources increasingly depleted, but also the trend of heavy and inferior quality is intensifying. The continuous development of the world economy and increasingly stringent environmental protection regulations require the production of a large amount of light and clean fuels, which require the improvement of the existing refining technology. Add new oil substitutes while improving, and produce products that meet the requirements at the lowest cost. Catalytic cracking is one of the important means of lightening heavy oil, but with the deterioration and heavyness of catalytic crack...

AI Technical Summary

Problems solved by technology

However, the H generated during the processing of this method 2 O has a very adverse effect on the hydrogenation catalyst of wax oil, and the CO and CO produced by the hydrogenation reaction of bio-oil 2 It will adversely affect the performance of the hydrogenation catalyst, and the simultaneous methanation reaction will greatly increase the temperature rise, even to an uncontrollable level, and the final methane is difficult to discharge from the system, thereby greatly reducing the hydrogen partial pressure of the reaction system, or Methane is discharged through the method of emission, which greatly increases the hydrogen consumption of the device

[0007] In the bio-oil hydrogenation process including the above method, one of the main problems encountered is that the carbon deposition in the bed causes the shortening of the operation cycle, and frequent shutdowns are required to replace the catalyst, especially when the bio-oil is used as a raw material alone or the mixing ratio of bio-oil is high. , the operating cycle of the hydrogenation catalyst is more significantly affected

For the hydrogenation unit for blending bio-oil, the H produced in the reaction process 2 O, CO, and CO 2 and CH 4 etc. will have a very adverse effect on the existing hydrogenation catalyst system

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