连续监测饮料生产中的硫化物异味

在饮料生产过程中,外部气味成分的添加和/或风味平衡的改变会产生"异味 ",这些气味会损害产品的口味,从而降低产品的质量。

就啤酒而言,异味可以在正常的发酵过程中产生,但也可能源于注入的二氧化碳中的杂质。

硫化氢是在发酵过程中产生的,具有代表性的“异味”。为了尽量减少其在生产过程中的产生,要控制发酵条件和酵母菌株的选择。

使用气相色谱法进行实验室气体分析的人工取样通常用于分析异味种类,如果需要对硫化物异味作出更快反应,则需要在线监测硫化物以进行质量控制。

Overview of Carbon Dioxide Production Process

Carbon dioxide (later, CO2) for food and beverage industry is produced in two different ways. For carbonated soft drinks such as coke, it is produced as by-product of ammonia synthesis process in petrochemical plant. Then, CO2 is purified in gas manufacturer’s purification plant, and finally sold to beverage manufacturers.

Figure 1: Production process of carbon dioxide as by-product from petrochemical plants

Figure 1: Production process of carbon dioxide as by-product from petrochemical plants

For brewery, carbon dioxide is produced as by-product during the yeast fermentation process. Breweries prevent CO2 from going into the atmosphere by utilizing the gas for their products.

Figure 2: Production process of carbon dioxide as by-product from fermentation in breweries

Figure 2: Production process of carbon dioxide as by-product from fermentation in breweries

The Reason to Measure Sulfide Off-Flavors in Carbon Dioxide

Sulfur, or hydrogen sulfide, is a gas that has a characteristic foul odor of rotten eggs, which can lead to bad smell and bad taste of beverages. CO2 that is produced from fermentation process in brewery or from ammonia synthesis process in petrochemical plant have small amount of hydrogen sulfide.

For example, brewery (beer manufacturer) have fermentation process in their production line, where beer is manufactured from malt, hop, water and yeast. The yeast creates fermentation, where sugar (dextrose) breaks down into ethanol and CO2 in the absence of oxygen.

C6H12O6 (dextrose) → 2C2H5OH (ethanol) + 2CO2 (carbon dioxide)

In the fermentation process, yeast consumes sugar and expels a large amount of CO2 which can be “reclaimed” and used for beer. Unfortunately, during fermentation process, it also produces toxic, odorous sulfides which can foam up into the piping and contaminate the reclaimed CO2. In order to continue using the reclaimed CO2 byproduct but avoid the contamination of bottled beer with foul-smelling toxins, the reclaimed gas is run through deodorizing process shown in the Figure 3 below. However, sulfide breakthrough can occur if the CO2 gas did not spend enough time in the scrubber. Employees are sometimes tasked with sniff-testing of the reclaimed CO2, but this is an unhealthy practice and is very discrete to vigilantly prevent product contamination.

Another practice is batch measurement with gas chromatography conducted in the lab, but it will never give real time data, consequently it might be very hard to find out the contamination problem quickly. Finally, batch measurement is very expensive and contaminated CO2, which exceeds purity standards is simply sold cheaply or dumped.

Continuous monitoring is a very cost-efficient solution, as it can immediately prevent the use of contaminated CO2 in bottling beer as well as provide feedback to process control engineers for the processing time of sulfur removal. HORIBA can provide sulfide analyzer in CO2 base gas as a continuous monitoring solution to prevent sulfide contamination in brewery products.

Figure 3: The process of CO₂ reclaiming in brewery

Figure 3: The process of CO₂ reclaiming in brewery

问题

​​​​​​饮料制造商和二氧化碳气体供应商的质量控制人员的评论

  • 当检测到杂质气体时,需要立即反馈到生产线上。
  • 目前的采样和手工分析方法很耗时。
  • 二氧化碳作为工厂的副产气体,需要控制其杂质,以便在碳酸饮料中使用。
  • 通过在生产线上连续测量二氧化碳气体,可以实现降低成本和提高质量。
  • 不仅是硫化氢,还有其他硫化物需要测量。

HORIBA 提供的解决方案

硫化氢监测仪成为新的解决方案!

与硫化物异味相关的气体可以作为硫化氢来测量,具备高灵敏度

  • 高灵敏度的连续测量

    在分析仪中对氧化后的硫化物异味进行高灵敏度的测量 (0-10 ppb)。 *请咨询我们可以测量的硫化物。

  • 自动分析仪校准

    可以根据任何需要的日期和时间提前设置现场维护工作,从而实现高效的校准。

  • 在多个采样点之间进行切换(可选)

    可以切换多个采样点进行测量。

配置实例

[高灵敏度] 硫化氢监测仪 + 定制化

[High Sensitivity]  Sulfide Off-Flavor Monitor + Customization 
Table 2: Specifications of APSA-370+Special CU-1

Table 2 : Specifications of APSA-370+Special CU-1

二氧化碳质量控制与异味的控制

 Carbon dioxide gas (CO2) analyzer for beverages VA-5001R  

饮料用二氧化碳气体(CO2)分析仪 VA-5001R

相关资料

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