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Production method of isooctyl nitrate

A technology of isooctyl nitrate and production method, applied in the directions of nitrate preparation, chemical instruments and methods, mixers, etc., can solve the problems of low space-time efficiency, uneven material distribution, low reaction space velocity conditions and the like, and achieve product high quality effect

Pending Publication Date: 2018-04-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Among the above-mentioned patents, CN 101462962B theoretically proposed a basic method for nitrating isooctyl alcohol in a microreactor, but due to the lack of understanding of the decomposition mechanism and reaction speed of the process, the method has not been perfected; the patent CN201410202348 has a low reaction temperature and requires a low reaction space velocity condition or build a very long microchannel structure, and the space-time efficiency is low; CN 104892425A adopts a low-concentration sulfuric acid process, and the content of nitric acid in its mixed acid is low, so the amount of waste acid is larger
In the patent CN201510037012 combined nitration process, there may be uneven distribution of materials in the tube reactor. For the safe production of nitrates, it is necessary to ensure uniform distribution of reactants; because it also reacts at 0-10 ° C, the volume of the tube reactor is large. The high liquid holding capacity of the nitrification unit also brings potential safety hazards

Method used

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  • Production method of isooctyl nitrate

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Effect test

Embodiment 1

[0021] Nitrification process equipment: The micromixer is made of two Inconel 600 plates after chemically etched into the microchannels and manufactured by vacuum diffusion welding. According to the requirements of the present invention, the length, width, and depth of the inlet channel of the micromixer are respectively designed and processed to 150mm, 3mm, 0.75mm, 16 mixing channels, 100mm, 1mm and 0.75mm in length, width and depth respectively. There are 32 side channels of the reaction material in the micro heat exchanger, and the length, width and depth are the same as the mixing channel of the micro mixer. After the micro heat exchanger is connected to a Ф20×2.5×3000mm single-tube reactor with a sleeve heat exchange, the outlet of the single-tube reactor is connected with a glass automatic separator to separate the ester mixture. The single tube reactor casing and the heat transfer channels of the micro heat exchanger and the micro mixer are connected in series, and the h...

Embodiment 2

[0028] Nitrification process equipment: The micromixer is made of 1 Inconel 600 plate after chemically etched out of the microchannels and manufactured by vacuum diffusion welding. The length, width, and depth of the inlet channel of the micromixer are 150mm, 3mm, and 0.5mm respectively, and the mixing channel is 8 The length, width and depth are 100mm, 1mm and 0.5mm respectively. There are 32 side channels of the reaction material in the micro heat exchanger, and the length, width and depth are the same as the mixing channel of the micro mixer. After the micro heat exchanger is connected to a Ф6×1×6000mm single-tube reactor, the outlet of the single-tube reactor is connected with a glass automatic separator to separate the ester mixture. The heat exchange channels of the micro heat exchanger and the micro mixer are connected in series, and a constant flow pump with a maximum flow of 60L / h is used to transfer the heat of 20℃ tap water.

[0029] The raw material preparation and f...

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Abstract

The invention provides a production method of isooctyl nitrate. The method mainly comprises the following steps that metered conveyance of nitro-sulfuric acid and isooctanol raw materials is performedthrough reliable and stable feeding equipment; the two strands of raw materials are mixed for reaction in a micro mixer; the mixed materials are subjected to heat exchange in a micro heat exchanger and enter a single pipe reactor for further reaction; acidic isooctyl nitrate and waste acid are separated out from a reaction product in an automatic separator; the acidic isooctyl nitrate is fast treated by a conventional water washing, alkali washing and water washing process in a series of micro mixers, and is finally dried or subjected to still standing to remove moisture to obtain a product of isooctyl nitrate. The method has the advantages that the nitration process is safe and efficient; the raw material isooctanol conversion rate and the product selectivity are higher than 99.5 percent; the product acidity value can reach 0.

Description

Technical field [0001] The invention relates to a micro-reaction technology nitrification process, in particular to a process for nitrating isooctyl alcohol to produce isooctyl nitrate by combining a micro mixer and a tubular reactor. Background technique [0002] Alcohol nitration (also called esterification) to synthesize nitrate is an extremely dangerous type of reaction in industry. Among them, nitroglycerin and isooctyl nitrate are the two most valuable products for military and civilian use respectively. [0003] Isooctyl nitrate is an important diesel fuel additive. Increasing diesel cetane number (CN value) can accelerate diesel ignition and improve engine performance. The production of isooctyl nitrate is an extremely dangerous reaction process. In the prior art, the method of nitrating isooctyl alcohol with mixed acid is generally used for production. The main feature is that fuming nitric acid and concentrated sulfuric acid are used to prepare mixed acid. Octanol react...

Claims

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Application Information

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IPC IPC(8): C07C201/02C07C203/04B01F13/00B01J19/24
CPCB01J19/0013B01J19/2415C07C201/02B01F33/30C07C203/04
Inventor 陈光文焦凤军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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