Continuous post-treatment technique and device of ethylhexyl nitrate

Abstract

The invention relates to a continuous post-treatment technique of ethylhexyl nitrate and a continuous post-treatment device of ethylhexyl nitrate. The technique includes alkali washing, water washing,and separated dehydration technique of a crude product; alkali washing and water washing devices connected in order are applied to continuously treat ethylhexyl nitrate; the back end of the water washing device is provided with a dehydration device to refine the ethylhexyl nitrate and obtain a final product. By adopting the technique and the device, the continuous separating and purifying processes of the ethylhexyl nitrate are successfully realized, the separated settling time is reduced, and the production efficiency is improved; the consumption of alkali fluid and washing water is reduced,the waste liquid is greatly reduced; quality of the product for purifying is much better than the industrial standard requirement, thus the oil water emulsion in the water washing process is solved,the mass transfer area is enlarged, and the mass transfer rate is improved; the mass transfer between different object phases is realized, the mass transfer function is enhanced, and the energy consumption in the mass transfer process is effectively reduced; the continuous post-treatment technique has the advantages of saving investment, reducing floor area, saving operation cost, and effectivelyreducing waste liquid.

Description

technical field

[0001] The invention belongs to the technical field of separation and purification devices for fine chemical products, and in particular relates to a continuous aftertreatment process and equipment for isooctyl nitrate. Background technique

[0002] Isooctyl nitrate is a cetane number improver for diesel oil. Adding it to diesel oil can increase the cetane number of diesel oil and has little effect on the properties of other oil products. Selecting isooctyl nitrate with excellent performance is of great significance for improving diesel quality, reducing exhaust emissions, reducing fuel consumption, and increasing the output of high-standard diesel.

[0003] In the existing isooctyl nitrate production technology, the production method generally adopts the mixed acid method, that is, at normal temperature or lower than normal temperature, isooctyl alcohol is added to the mixed acid composed of nitric acid and sulfuric acid to extract or separate the isooctyl n...

Examples

Embodiment 1

[0026] A continuous post-treatment process of isooctyl nitrate, comprising sequentially connected crude product alkali washing, water washing and separation and dewatering processes, wherein the specific steps are:

[0027] The prepared isooctyl nitrate crude ester is transported from the crude ester tank through the isooctyl nitrate delivery pump to the top of the alkali washing membrane separation device on the top of the alkali washing phase separation tank, where the top is mixed with the alkali solution transported by the alkali solution delivery pump. In contact with lye, the lye has been circulated before starting to work, firstly wet the fiber membrane of the alkali cleaning membrane separation equipment, and flow down along the fiber filaments, and isooctyl nitrate flows in parallel with the lye along the fiber bundle, making the nitric acid Between the isooctyl ester and the lye, a flowing film is formed on the fiber bundle, thereby increasing the mass transfer area a...

Embodiment 2

[0036] All steps of this embodiment are consistent with the steps in embodiment 1,

[0037] Wherein said lye is selected from sodium hydroxide solution, and the mass percentage is 30%;

[0038] The number of alkali washing is first-level alkali washing;

[0039] The crude isooctyl nitrate feed flow pump and the lye feed flow weight ratio are at 10:1, and the control isooctyl nitrate crude ester feed flow and washing water feed flow weight ratio is at 3:1;

[0040] After testing, the acidity of isooctyl nitrate crude ester is 200-700mgKOH / g, the metal content (the sum of sodium, potassium, magnesium, calcium, iron and zinc content) is 100-200ppm, and the moisture content is 5000-7000ppm;

[0041] After treatment, the acidity of isooctyl nitrate is 3.36mgKOH / g, the metal content is 4.0ppm, and the moisture content is 163ppm; it can be seen that the continuous post-treatment process of isooctyl nitrate provided by the present invention can effectively improve the quality of isoo...

Embodiment 3

[0043] All steps of this embodiment are consistent with the steps in embodiment 1,

[0044] Wherein said lye is selected from sodium hydroxide solution, and the mass percentage is 40%;

[0045] The number of alkali washing is first-level alkali washing;

[0046] The crude isooctyl nitrate feed flow pump and the lye feed flow weight ratio are at 10:1, and the control isooctyl nitrate crude ester feed flow and washing water feed flow weight ratio is at 5:1;

[0047] After testing, the acidity of isooctyl nitrate crude ester is 200-700mgKOH / g, the metal content (the sum of sodium, potassium, magnesium, calcium, iron and zinc content) is 100-200ppm, and the moisture content is 5000-7000ppm;

[0048] After treatment, the acidity of isooctyl nitrate is 1.38mgKOH / g, the metal content is 3.6ppm, and the moisture content is 121ppm; it can be seen that the continuous post-treatment process of isooctyl nitrate provided by the present invention can effectively improve the quality of isoo...

technical field

[0001] The invention belongs to the technical field of separation and purification devices for fine chemical products, and in particular relates to a continuous aftertreatment process and equipment for isooctyl nitrate. Background technique

[0002] Isooctyl nitrate is a cetane number improver for diesel oil. Adding it to diesel oil can increase the cetane number of diesel oil and has little effect on the properties of other oil products. Selecting isooctyl nitrate with excellent performance is of great significance for improving diesel quality, reducing exhaust emissions, reducing fuel consumption, and increasing the output of high-standard diesel.

[0003] In the existing isooctyl nitrate production technology, the production method generally adopts the mixed acid method, that is, at normal temperature or lower than normal temperature, isooctyl alcohol is added to the mixed acid composed of nitric acid and sulfuric acid to extract or separate the isooctyl n...

Examples

Embodiment 1

[0026] A continuous post-treatment process of isooctyl nitrate, comprising sequentially connected crude product alkali washing, water washing and separation and dewatering processes, wherein the specific steps are:

[0027] The prepared isooctyl nitrate crude ester is transported from the crude ester tank through the isooctyl nitrate delivery pump to the top of the alkali washing membrane separation device on the top of the alkali washing phase separation tank, where the top is mixed with the alkali solution transported by the alkali solution delivery pump. In contact with lye, the lye has been circulated before starting to work, firstly wet the fiber membrane of the alkali cleaning membrane separation equipment, and flow down along the fiber filaments, and isooctyl nitrate flows in parallel with the lye along the fiber bundle, making the nitric acid Between the isooctyl ester and the lye, a flowing film is formed on the fiber bundle, thereby increasing the mass transfer area a...

Embodiment 2

[0036] All steps of this embodiment are consistent with the steps in embodiment 1,

[0037] Wherein said lye is selected from sodium hydroxide solution, and the mass percentage is 30%;

[0038] The number of alkali washing is first-level alkali washing;

[0039] The crude isooctyl nitrate feed flow pump and the lye feed flow weight ratio are at 10:1, and the control isooctyl nitrate crude ester feed flow and washing water feed flow weight ratio is at 3:1;

[0040] After testing, the acidity of isooctyl nitrate crude ester is 200-700mgKOH / g, the metal content (the sum of sodium, potassium, magnesium, calcium, iron and zinc content) is 100-200ppm, and the moisture content is 5000-7000ppm;

[0041] After treatment, the acidity of isooctyl nitrate is 3.36mgKOH / g, the metal content is 4.0ppm, and the moisture content is 163ppm; it can be seen that the continuous post-treatment process of isooctyl nitrate provided by the present invention can effectively improve the quality of isoo...

Embodiment 3

[0043] All steps of this embodiment are consistent with the steps in embodiment 1,

[0044] Wherein said lye is selected from sodium hydroxide solution, and the mass percentage is 40%;

[0045] The number of alkali washing is first-level alkali washing;

[0046] The crude isooctyl nitrate feed flow pump and the lye feed flow weight ratio are at 10:1, and the control isooctyl nitrate crude ester feed flow and washing water feed flow weight ratio is at 5:1;

[0047] After testing, the acidity of isooctyl nitrate crude ester is 200-700mgKOH / g, the metal content (the sum of sodium, potassium, magnesium, calcium, iron and zinc content) is 100-200ppm, and the moisture content is 5000-7000ppm;

[0048] After treatment, the acidity of isooctyl nitrate is 1.38mgKOH / g, the metal content is 3.6ppm, and the moisture content is 121ppm; it can be seen that the continuous post-treatment process of isooctyl nitrate provided by the present invention can effectively improve the quality of isoo...

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