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Production process for preparing magnesium sulfate by using alkylation waste acid

A technology of alkylation waste acid and production process, applied in the direction of magnesium sulfate, magnesium fertilizer, application, etc., can solve the problems of high environmental protection pressure, increase the total investment of the device, and more equipment, and achieve the effect of low production cost

Active Publication Date: 2020-02-14
青岛锐丰源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is cracking to produce industrial sulfuric acid. This process is mature and the required fuel can be easily provided by the refinery. The waste acid is treated more thoroughly. The disadvantages are: first, the refinery does not have a sulfuric acid treatment device, and this process needs to be increased. Supporting sulfuric acid production device, in addition, the process is long, there are many equipments, complicated control, and one-time investment is increased; second, the operation cost is high, the device consumes a large amount of fuel gas and electricity every year, the energy consumption is large, and the required catalyst is expensive; third , environmental protection pressure is high, the concentration of sulfur dioxide emitted from the chimney of this process route is about 760mg / Nm 3 , such as meeting the emission concentration limit of sulfur dioxide pollutants 400mg / Nm 3 According to the requirements of the regulations, a set of long-term purification devices must be built, such as ammonia desulfurization, alkali desulfurization, etc., which will increase the total investment of the device
However, because waste acid contains 10-30% organic matter, the main monomers of organic matter are macromolecule olefins, diolefins, polymers, alkylsulfonic acids, sulfuric acid esters, etc. In the existing process for preparing magnesium sulfate, organic matter cannot be processed , so after the above reaction treatment, the organic matter in the waste acid remains in the prepared solid magnesium sulfate, resulting in many impurities in the magnesium sulfate, the purity will be greatly low, and the color of the magnesium sulfate will turn yellow.

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  • Production process for preparing magnesium sulfate by using alkylation waste acid

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Embodiment 1

[0031] The invention discloses a production process for preparing magnesium sulfate by using alkylation waste acid. The process comprises the following steps.

[0032] In the first step, the reaction generates solid magnesium sulfate.

[0033] The magnesium oxide powder was continuously stirred, and during the stirring process, alkylated waste acid was added to the magnesium oxide powder. In this embodiment, the concentration of concentrated sulfuric acid was 85% by mass. Concentrated sulfuric acid in the alkylation waste acid reacts with magnesium oxide powder to form solid magnesium sulfate. At the same time, a large amount of heat is released during the reaction, which creates a high-temperature reaction environment in the reactor. The temperature can reach more than 300 °C, and the high temperature makes the alkyl The organic matter in the spent acid is carbonized to produce solid dross whose main component is carbon.

[0034] The mass percentage concentration of magnesiu...

Embodiment 2

[0059] The difference from Example 1 is: in this example, the mass percent concentration of concentrated sulfuric acid is 87%. Concentrated sulfuric acid in the alkylation waste acid reacts with magnesium oxide powder to form solid magnesium sulfate. At the same time, a large amount of heat is released during the reaction, which creates a high-temperature reaction environment in the reactor. The temperature can reach more than 300 °C, and the high temperature makes the alkyl The organic matter in the spent acid is carbonized to produce solid dross whose main component is carbon.

[0060] The mass percentage concentration of magnesium oxide adopted in the present embodiment is 83%, and in the stirring process, the injection flow rate of alkylation waste acid is 0.4m 3 / h, the stirring speed of magnesium oxide powder is 17 rpm.

[0061] During the reaction, the mass ratio of magnesium oxide powder to the injected alkylation waste acid is 1:2.3. In this embodiment, 1 ton of magn...

Embodiment 3

[0064] The difference from Example 1 is: in this example, the mass percent concentration of the concentrated sulfuric acid is 89%. Concentrated sulfuric acid in the alkylation waste acid reacts with magnesium oxide powder to form solid magnesium sulfate. At the same time, a large amount of heat is released during the reaction, which creates a high-temperature reaction environment in the reactor. The temperature can reach more than 300 °C, and the high temperature makes the alkyl The organic matter in the spent acid is carbonized to produce solid dross whose main component is carbon.

[0065] The mass percentage concentration of magnesium oxide adopted in the present embodiment is 87%, and in the stirring process, the injection flow rate of alkylation waste acid is 0.6m 3 / h, the stirring speed of magnesium oxide powder is 14 rpm.

[0066] During the reaction, the mass ratio of magnesium oxide powder to the injected alkylation waste acid is 1:2.5. In this embodiment, 1 ton of ...

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Abstract

The invention relates to the field of alkylation waste acid treatment, in particular to a production process for preparing magnesium sulfate from alkylation waste acid. The production process comprises the steps of reacting to generate solid magnesium sulfate, mixing to form a solution, neutralizing, performing solid-liquid separation, crystallizing, centrifuging, drying and the like. The processsufficiently utilizes concentrated sulfuric acid and organic substances in alkylation waste acid, can obtain solid magnesium sulfate with relatively high purity, does not cause any pollution on environment, and achieves the purpose of saving energy and reducing emission.

Description

technical field [0001] The invention relates to the field of alkylation waste acid treatment, in particular to a production process for preparing magnesium sulfate by using alkylation waste acid. Background technique [0002] At present, the situation of air pollution in my country is very severe, and the regional atmospheric environmental problems characterized by inhalable particulate matter (PM10) and fine particulate matter (PM2.5) are becoming increasingly prominent. In May 2015, seven departments including the National Development and Reform Commission, the Ministry of Finance, and the Ministry of Environmental Protection jointly issued the "Work Plan for Accelerating the Quality Upgrade of Refined Oil Products". Gasoline and diesel for vehicles. The overall quality improvement of gasoline and diesel is urgent, which requires oil refining companies to speed up the pace of upgrading and transformation, improve the production and supply capacity of clean oil products, f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40C05D5/00
CPCC01F5/40C05D5/00
Inventor 张玉纲
Owner 青岛锐丰源化工有限公司