Waste lubricating oil regeneration method and system

A waste lubricating oil and regeneration system technology, applied in the direction of lubricating compositions, etc., can solve problems such as easy coking and clogging of equipment during operation, complicated equipment technology, and serious secondary pollution, etc., to achieve extended stable operation period, reduced solvent loss, cooling The effect of reducing source consumption

Active Publication Date: 2020-02-18
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

[0003] According to the status quo and development of domestic waste lubricating oil regeneration technology in recent years, the most advanced foreign technology currently includes "film vacuum distillation and hydrofining" technology, but this process requires large investment, complicated equipment and technology, and requires more advanced technologies. High-quality waste oil is not compatible with the current situation in our country; the vast majority of others are still using "sulfuric acid-clay" technology, "topping distillation-acid-lime milk-clay" technology, "pretreatment-distillation-furfural- Clay clay" technology and "molecular distillation + base oil compound refining" technology, but because sulfuric acid or clay is used in these traditional technologies, the technology not only has low yield, poor quality, but also serious secondary pollution, and has been gradually eliminated by environmental protection; With the continuous research and application of domestic solvent extraction technology in waste oil refining, a relatively widely accepted "pretreatment and solvent extraction refining" technology has been formed.
[0004] In the process of solvent regeneration and refining of waste lubricating oil in actual industrial applications, the regeneration process adopts single-tower vacuum distillation, and a few of them add one-stage vacuum distillation or scraping film after single-column distillation to reduce solvent loss. Evaporation, high energy consumption, large solvent loss, and easy coking and clogging of equipment during the operation process have not attracted enough attention for the current small scale, strong intermittent and high profit level, but with the emergence of a large number of waste lubricating oil treatment devices , the continuous development of scale, and the search for more energy-saving and more stable process technology will be new challenges for enterprises to continuously reduce production costs and achieve sustainable development goals

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  • Waste lubricating oil regeneration method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment adopts figure 1 The waste lubricating oil regeneration system shown performs regeneration of waste lubricating oil using N-methylpyrrolidone (NMP) as a solvent, and the regeneration method is as follows:

[0026] 18.18t / h of waste lubricating oil raw material is pretreated to remove water, light components and heavy components, and the base distillate oil produced is 15.05t / h into the solvent extraction tower T4, and the solvent NMP volume after regeneration is 30.0t / h (The extraction ratio is selected as 2:1) into the solvent extraction tower T4, the raffinate phase is desolventized, stripped and deodorized to obtain 12.12t / h base oil; the flow rate of the extracted phase is 32.83t / h after heat exchange drying and light removal The temperature is 180°C and enters the first-effect regeneration tower T8.

[0027] The operating pressure of the first-effect regeneration tower T8 is normal pressure, the temperature at the top of the tower is 202°C, bubble p...

Embodiment 2

[0031] Using the same waste lubricating oil regeneration process as in Example 1, the operating pressure of the first-effect regeneration tower T8 is 0.10MPa, the tower top temperature is 220°C, the bubble point is refluxed, the reflux ratio is 0.5, the output is 11.0t / h, and the tower kettle reboiler , the normal heat load is 2.36MKcal / h; the operating pressure of the second-effect regeneration tower T9 is 1.0KPa(A), the temperature at the top of the tower is 72.5°C, the gas phase temperature at the bottom of the tower is 120°C, the reflux ratio is 0.56, and the output is 19.0t / h. The operating pressure of the primary evaporator T8 is 1.0KPa(A), the evaporation temperature is 230°C, the processing feed rate is 3.0t / h, it is heated by heat conduction oil, and the heat load is 0.22MKacal / h, and the output oil flow rate is 2.83t / h, of which NMP content 0.1%.

[0032] It can be seen from the above results that after changing the operating temperature and pressure of the two regen...

Embodiment 3

[0034] This embodiment adopts figure 1 The waste lubricating oil regeneration system shown performs regeneration of waste lubricating oil using N-methylpyrrolidone (NMP) as a solvent, and the regeneration method is as follows:

[0035] After 7.0t / h of waste lubricating oil raw material is pretreated to remove water, light components and heavy components, two kinds of basic distillate oils are recovered, which are 4.6t / h and 1.2t / h respectively, and are extracted by two series respectively , single-series solvent regeneration. After regeneration, solvent NMP volumes of 8.0t / h and 2.2t / h (extraction ratio 1.7~1.9:1) respectively enter the respective series of solvent extraction towers T4, and the raffinate phase is desolventized, stripped and deodorized to obtain 4.1t / h No. 1 base oil, 1.1t / h No. 2 base oil; the two extraction phases are mixed and delightened by heat exchange drying, and the flow rate is 10.8t / h, and the temperature is ~150°C and enters the first-effect regener...

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Abstract

The invention discloses a waste lubricating oil regeneration method and system. The regeneration system comprises a pretreatment system, an extraction and refining system and a regenerative system. According to the process of performing waste lubricating oil regeneration by the adoption of the regeneration system, waste lubricating oil is pretreated to obtain basic distillate oil, the basic distillate oil is subjected to solvent extraction and refining to obtain a lubricating oil basic oil product, an extraction phase obtained after extraction and separation is subjected to two-effect solventregenerative rectification, a heavy component obtained after two-effect regenerative rectification is subjected to first evaporation treatment, an evaporated solvent is used as an extraction solvent cyclically, and extracted oil obtained through extraction is used as a by-product. According to the method, by adjusting running parameters of the two-effect regenerative rectification and the first evaporation, the solvent regeneration effect is improved, solvent loss is reduced, operation energy consumption is lowered, and running stability is improved; and compared with the prior art, under thesame regenerative effect, energy can be saved by 40% or above, the solvent content in the heavy component is not greater than 0.5%, long-term stable running can be realized, and the method and systemare suitable for industrial large-scale production and utilization.

Description

technical field [0001] The invention belongs to the field of chemical technology, in particular to a method and system for regenerating waste lubricating oil. Background technique [0002] With the rapid development of the economy, the demand for lubricating oil continues to rise, making the amount of waste lubricating oil replaced is also increasing. Waste lubricating oil belongs to organic petroleum hydrocarbons, which is non-degradable and toxic, so it is highly polluting. If it is discarded or disposed of improperly, it will not only waste resources, but also cause great harm to the environment. In order to build an environment-friendly and resource-saving society, it is an inevitable choice to regenerate waste lubricating oil to refine base oil by adopting advanced technology and equipment, and to promote domestic lubricating oil manufacturing and use to a circular economy. [0003] According to the status quo and development of domestic waste lubricating oil regenerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M175/00
CPCC10M175/0033C10M175/0075
Inventor 林必华郭继奎马可张树杨吴坤王崇容
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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