Continuous production process of isooctyl nitrate

Abstract

The invention provides a continuous production process of isooctyl nitrate. The continuous production process comprises the following steps: metering concentrated sulfuric acid and concentrated nitric acid via a metering tank, adding the concentrated sulfuric acid and the concentrated nitric acid into a stirring kettle for uniformly stirring and mixing; respectively injecting mixed acid and isooctanol into two coolers for cooling, injecting the mixed acid and the isooctanol into a reactor assembly for mixing and reacting after the mixed acid and isooctanol are cooled to be lower than or equal to 15 DEG C, and firstly mixing in an efficient mixer in the reactor assembly; adding the uniformly-mixed material into a reaction thin tube through a distribution tank for reacting, and filling the periphery of the fine tube with cooling water; collecting reaction products via a collector, then adding the reaction products into a centrifugal machine for separating acid ester, and removing waste acid; refining and deacidifying coarse products via a 10wt% sodium hydroxide solution in an alkaline washing tower; enabling deacidified products to continuously flow into a settling tank from the alkaline washing tower for settling and dewatering, and adding the deacidified products into a drying tower for drying to obtain a product. Through the production process, the problem about safety in the existing process is solved; the production efficiency is improved; the production stability is improved; the cost is reduced.

Description

technical field

[0001] The invention relates to the petrochemical field, in particular to a continuous production process of isooctyl nitrate. Background technique

[0002] Isooctyl nitrate is used as a cetane number improver for diesel oil. The traditional synthesis method uses concentrated sulfuric acid as a catalyst to nitrate isooctyl alcohol. The characteristics of this reaction are: (1) When the initial reaction temperature is greater than 30°C, the reaction is almost instantaneously completed, and the reaction speed of each mixed acid of isooctyl alcohol depends on the mass transfer rate of the two phases. (2) The heat of reaction is large, and it is reported that the heat of reaction is 700KJ / Kg alcohol. (3) When the heat generated by the reaction raises the temperature of the system material (the mixture of isooctyl nitrate and mixed acid) to 40°C, the resulting product isooctyl nitrate is easily decomposed into free radicals in an oxidizing acid environment, resul...

Examples

Embodiment 1

[0018] A continuous production process for isooctyl nitrate, comprising the following steps:

[0019] The first step: measure concentrated sulfuric acid and concentrated nitric acid through a metering tank, and put them into a stirring tank at a volume ratio of 0.8 to stir and mix evenly;

[0020] Step 2: inject the mixed acid and isooctyl alcohol into two coolers through the metering pump according to the volume flow ratio of 1 for cooling. After the temperature is 15°C, inject them into the reactor assembly for mixed reaction. Mix first in the high-efficiency mixer, and the mixing time is 10ms;

[0021] Step 3: The uniformly mixed material enters the narrow reaction tube through the distribution tank for reaction. Cooling water is passed around the narrow tube. The reaction time is 23s, the temperature of the cooling water is 10°C, and the flow rate is 3.0m / s;

[0022] Step 4: The reaction product is collected by the current collector and then enters the centrifuge for este...

Embodiment 2

[0027] A continuous production process for isooctyl nitrate, comprising the following steps:

[0028] The first step: measure concentrated sulfuric acid and concentrated nitric acid through a metering tank, and put them into a stirring tank at a volume ratio of 0.7 to stir and mix evenly;

[0029] Step 2: inject the mixed acid and iso-octanol into two coolers through the metering pump according to the volume flow ratio of 0.91 for cooling. After the temperature is 13°C, inject them into the reactor assembly for mixed reaction. Mix first in the high-efficiency mixer, and the mixing time is 15ms;

[0030] Step 3: The uniformly mixed material enters the narrow reaction tube through the distribution tank for reaction. Cooling water is passed around the narrow tube. The reaction time is 15s, the temperature of the cooling water is 12°C, and the flow rate is 2.5m / s;

[0031] Step 4: The reaction product is collected by the current collector and then enters the centrifuge for ester ...

Embodiment 3

[0036] A continuous production process for isooctyl nitrate, comprising the following steps:

[0037] The first step: measure concentrated sulfuric acid and concentrated nitric acid through a metering tank, and put them into a stirring tank at a volume ratio of 0.4 to stir and mix evenly;

[0038] Step 2: Inject the mixed acid and isooctyl alcohol into two coolers with a volume flow ratio of 0.6 through the metering pump for cooling. After the temperature is 10°C, inject them into the reactor assembly for mixed reaction. Mix first in the high-efficiency mixer, and the mixing time is 5ms;

[0039] Step 3: The uniformly mixed material enters the narrow reaction tube through the distribution tank for reaction. Cooling water is passed around the narrow tube. The reaction time is 5s, the temperature of the cooling water is 15°C, and the flow rate is 1.5m / s;

[0040] Step 4: The reaction product is collected by the current collector and then enters the centrifuge for ester acid sep...

technical field

[0001] The invention relates to the petrochemical field, in particular to a continuous production process of isooctyl nitrate. Background technique

[0002] Isooctyl nitrate is used as a cetane number improver for diesel oil. The traditional synthesis method uses concentrated sulfuric acid as a catalyst to nitrate isooctyl alcohol. The characteristics of this reaction are: (1) When the initial reaction temperature is greater than 30°C, the reaction is almost instantaneously completed, and the reaction speed of each mixed acid of isooctyl alcohol depends on the mass transfer rate of the two phases. (2) The heat of reaction is large, and it is reported that the heat of reaction is 700KJ / Kg alcohol. (3) When the heat generated by the reaction raises the temperature of the system material (the mixture of isooctyl nitrate and mixed acid) to 40°C, the resulting product isooctyl nitrate is easily decomposed into free radicals in an oxidizing acid environment, resul...

Examples

Embodiment 1

[0018] A continuous production process for isooctyl nitrate, comprising the following steps:

[0019] The first step: measure concentrated sulfuric acid and concentrated nitric acid through a metering tank, and put them into a stirring tank at a volume ratio of 0.8 to stir and mix evenly;

[0020] Step 2: inject the mixed acid and isooctyl alcohol into two coolers through the metering pump according to the volume flow ratio of 1 for cooling. After the temperature is 15°C, inject them into the reactor assembly for mixed reaction. Mix first in the high-efficiency mixer, and the mixing time is 10ms;

[0021] Step 3: The uniformly mixed material enters the narrow reaction tube through the distribution tank for reaction. Cooling water is passed around the narrow tube. The reaction time is 23s, the temperature of the cooling water is 10°C, and the flow rate is 3.0m / s;

[0022] Step 4: The reaction product is collected by the current collector and then enters the centrifuge for este...

Embodiment 2

[0027] A continuous production process for isooctyl nitrate, comprising the following steps:

[0028] The first step: measure concentrated sulfuric acid and concentrated nitric acid through a metering tank, and put them into a stirring tank at a volume ratio of 0.7 to stir and mix evenly;

[0029] Step 2: inject the mixed acid and iso-octanol into two coolers through the metering pump according to the volume flow ratio of 0.91 for cooling. After the temperature is 13°C, inject them into the reactor assembly for mixed reaction. Mix first in the high-efficiency mixer, and the mixing time is 15ms;

[0030] Step 3: The uniformly mixed material enters the narrow reaction tube through the distribution tank for reaction. Cooling water is passed around the narrow tube. The reaction time is 15s, the temperature of the cooling water is 12°C, and the flow rate is 2.5m / s;

[0031] Step 4: The reaction product is collected by the current collector and then enters the centrifuge for ester ...

Embodiment 3

[0036] A continuous production process for isooctyl nitrate, comprising the following steps:

[0037] The first step: measure concentrated sulfuric acid and concentrated nitric acid through a metering tank, and put them into a stirring tank at a volume ratio of 0.4 to stir and mix evenly;

[0038] Step 2: Inject the mixed acid and isooctyl alcohol into two coolers with a volume flow ratio of 0.6 through the metering pump for cooling. After the temperature is 10°C, inject them into the reactor assembly for mixed reaction. Mix first in the high-efficiency mixer, and the mixing time is 5ms;

[0039] Step 3: The uniformly mixed material enters the narrow reaction tube through the distribution tank for reaction. Cooling water is passed around the narrow tube. The reaction time is 5s, the temperature of the cooling water is 15°C, and the flow rate is 1.5m / s;

[0040] Step 4: The reaction product is collected by the current collector and then enters the centrifuge for ester acid sep...

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