Method for producing natural benzaldehyde by employing three-way nozzle atomization
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A three-channel, benzaldehyde technology, used in organic chemistry, hydrolysis to prepare carbonyl compounds, etc., can solve the problems of low product quality, high price, and inability to further improve
Active Publication Date: 2012-07-04
SHANGHAI HUASHENG FLAVORING
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Because cinnamaldehyde and alkaline substance generate the reaction of natural benzaldehyde is a kind of reversible reaction, therefore, along with the carrying out of reaction, in the reaction product, the content of natural benzaldehyde constantly improves, and reaction speed constantly reduces, and the natural benzene in the reaction product Due to the reaction balance, the formaldehyde content cannot be further increased, which affects the reaction yield and reaction efficiency
Because be used to prepare food, the perfume of household chemistry has certain requirement, natural cinnamic aldehyde usually derives from the essential oil of natural plant, as osmanthus oil, so price is very expensive, meanwhile, natural benzaldehyde also can condense, therefore, present The production method leads to the production cost of natural benzaldehyde cannot be reduced, and the product quality is not high
[0005] The applicant's prior Chinese patent ZL.031152295 discloses a preparation method of natural benzaldehyde, which is sprayed into the reactor after atomized by a multi-channel nozzle arranged on the top of the reactor, so that cinnamon oil and alkaline substances are in the atomized state Undergo reaction, generate benzaldehyde, in order to overcome the defect that prior art exists, but, actual production process finds, because described multi-channel nozzle does not carry out specific design according to the performance of osmanthus oil and alkaline substance, therefore, atomization The effect is not ideal, and further improvement is needed
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Embodiment 1
[0025] Using 200 kg of cinnamon oil with 80% cinnamic aldehyde concentration as raw material, using figure 1 The three-channel nozzle and figure 2 Process for the preparation of natural benzaldehyde.
[0026] The structural parameters and operating conditions of the three-channel nozzle are as follows:
[0027] Center nozzle 206: ω is 20°, σ is 65°;
[0028] Inner nozzle 205: α is 30°, β is 65°;
[0029] Outer nozzle 204: is 30°;
[0030] The linear velocity of osmanthus oil at the end outlet of three-passage nozzle 2 is 20 meters per second,
[0031] The linear velocity of the material at the bottom of the reactor 1 at the end outlet of the three-channel nozzle 2 is 300 m / s;
[0032] React at 90°C for 1.5 hours, and the operating pressure during the reaction is 71kPa;
[0033] Alkaline substance is NaOH, and consumption is 0.04% of osmanthus oil weight; The weight concentration of NaOH aqueous solution is 5%;
[0034] After the reaction, 83.9 kg of natural benzaldeh...
Embodiment 2
[0036] Using 200 kg of cinnamon oil with 80% cinnamic aldehyde concentration as raw material, using figure 1 The three-channel nozzle and figure 2 Process for the preparation of natural benzaldehyde.
[0037] The structural parameters and operating conditions of the three-channel nozzle are as follows:
[0038] Center nozzle 206: ω is 10°, σ is 50°;
[0039] Inner nozzle 205: α is 10°, β is 50°;
[0040] Outer nozzle 204: is 10°;
[0041] The linear velocity of osmanthus oil at the end outlet of three-passage nozzle 2 is 10 m / s,
[0042] The linear velocity of the material at the bottom of the reactor 1 at the end outlet of the three-channel nozzle 2 is 50 m / s;
[0043] React at 80°C for 1.5 hours, and the pressure during the reaction is 47kPa;
[0044] Alkaline substance is Na 2 CO 3 , the consumption is 0.01% of osmanthus oil weight; The weight concentration of NaOH aqueous solution is 1%;
[0045] After the reaction, 84.8 kg of natural benzaldehyde with a weight...
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Abstract
The invention provides a method for producing natural benzaldehyde by a three-channel nozzle atomization method, which comprises the following steps: placing an aqueous solution of alkaline substances into a reactor of which the upper part is provided with a three-channel nozzle; sending materials at the bottom of the reactor to a central channel pipe and an external channel pipe of the three-channel nozzle through a circulating pump, and simultaneously sending cassia oil into an internal channel pipe of the three-channel nozzle through a conveying pump; and making the materials and the cassia oil at the bottom of the reactor ejected from the end part of the three-channel nozzle respectively, atomizing the cassia oil, making the atomized cassia oil contact the alkaline substances for reaction to generate the benzaldehyde. The method makes the cassia oil react with the alkaline substances in a fogdrop mode, has low reaction temperature, and can greatly improve the yield of the benzaldehyde and reduce generation of byproducts on the premise of maintaining the reaction rate, and the obtained benzaldehyde has more pure and tender flavor. As proved by a result of analysis by gas chromatography, the yield of the benzaldehyde can reach more than 62 percent.
Description
technical field [0001] The invention relates to a preparation method of natural benzaldehyde. Background technique [0002] Natural benzaldehyde is an important fragrance, which is widely used in food and daily chemical industry. [0003] With the improvement of people's living standards, people's requirements for the health of food are getting higher and higher. Especially for spices added in food, higher requirements are put forward. People not only pay more and more attention to adopting various natural spices as food additives, but also hope that the natural spices used have higher quality and lower price. Benzaldehyde is an important spice used in food and has a wide range of applications in the food field. At present, a large amount of natural benzaldehyde comes from apricot oil, but its application in the food field is limited due to the difficulty in separating the cyanide contained in the oil. Document [Guangxi Chemical Industry, 1997 No. 3 phase 1 reports a kin...
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