A colorimetric analysis system and method of using the same

Abstract

The present invention discloses a colorimetric analysis system and a method for using the same. The analysis system comprises components and pipelines, wherein the components include a colorimeter and a three-way valve; the colorimeter is connected to two three-way valves through pipelines, wherein an opening of one of the three-way valves is connected to a material inflow end of the colorimeter through a pipeline, and an opening of the other three-way valve is connected to a material outflow end of the colorimeter through a pipeline.

Description

Technical Field

[0001] The invention relates to the field of chemical engineering, and in particular to a multi-flow path online chromaticity analysis system. Background Art

[0002] The product refining tower of the styrene extraction unit uses chromaticity as a product control indicator. Generally, it is impossible to monitor the product chromaticity online, and the process parameters of the refining tower can only be adjusted based on the analysis results of offline sampling. There will be a lag in the adjustment, which can easily cause the product chromaticity to be unqualified. At the same time, in order to monitor the chromaticity changes during the decolorization process, the decolorant mixing tank, intermediate product tank, product refining tower, and product storage tank of the general unit must be analyzed offline multiple times a day, and only a single route can be tested each time. The sampling frequency is extremely high, which greatly increases the workload of operators and inspection costs.

[0003] Therefore, there is an urgent need in the art to provide a colorimetric analysis detection system with multiple flow paths that do not interfere with each other. Summary of the invention

[0004] The present invention aims to provide a colorimetric analysis system.

[0005] In a first aspect of the present invention, a colorimetric analysis system is provided, the analysis system comprising components and pipelines, the components comprising a colorimeter and a three-way valve; the colorimeter is connected to two three-way valves respectively through pipelines, wherein an opening of one of the three-way valves is connected to a material inflow end of the colorimeter through a pipeline, and an opening of the other three-way valve is connected to a material outflow end of the colorimeter through a pipeline.

[0006] In another preferred embodiment, the other two openings of the other three-way valve connected to the material outflow end of the colorimeter are respectively equipped with pipelines.

[0007] In another preferred embodiment, the other opening of the three-way valve connected to the material inlet end of the colorimeter is connected to an opening of another three-way valve through a pipeline; more preferably, the remaining two openings of the another three-way valve are respectively equipped with pipelines.

[0008] In another preferred embodiment, two openings of a fourth three-way valve are connected to the three-way valve connected to the material inlet end of the colorimeter and the further three-way valve through pipelines respectively.

[0009] In another preferred embodiment, the analysis system comprises:

[0010] – three-way valve (11), three-way valve (12), three-way valve (13), three-way valve (14) and colorimeter (15),

[0011] - a pipeline (1) connecting a product storage tank to an opening of a three-way valve (11),

[0012] - a pipeline (7) connecting the other opening of the three-way valve (11) to the inlet end of the colorimeter (15),

[0013] - a pipeline (9) connecting the outflow end of the colorimeter (15) to an opening of the three-way valve (14),

[0014] - a pipeline (5) connecting a mixing tank to the other opening of the three-way valve (14),

[0015] - a pipeline (6) connecting a product storage tank to an opening of a three-way valve (14),

[0016] - a pipeline (3) and / or a pipeline (4) connecting an intermediate product tank to the three-way valve (13),

[0017] – a pipeline (8) connected to a three-way valve (11) and a three-way valve (12),

[0018] – a pipeline (10) connected to a three-way valve (12) and a three-way valve (13),

[0019] - A pipeline (2) connecting a product storage tank to a three-way valve (12).

[0020] In a second aspect of the present invention, there is provided an application of the analysis system provided by the present invention as described above in online colorimetric analysis of chemical products.

[0021] In another preferred embodiment, the chemical product is a styrene product.

[0022] In a third aspect of the present invention, there is provided a method for online colorimetric analysis of chemical products using the analytical system provided by the present invention as described above, the method comprising the steps of:

[0023] (1) allowing the material from the refining tower product tank to enter the colorimeter through a three-way valve connected to the material inlet end of the colorimeter, and then flow to the stirring tank through another three-way valve connected to the material outlet end of the colorimeter for 1-10 minutes (preferably 2-7 minutes);

[0024] (2) another three-way valve connected to the material outflow end of the colorimeter is cut to the product tank of the refining tower;

[0025] (3) measuring the chromaticity of the material in the refining tower product tank for 5-15 hours (preferably 8-12 hours);

[0026] (4) The three-way valve connected to the outflow end of the colorimeter remains unchanged, so that the materials in the refining tower product tank and the intermediate product tank cannot enter the colorimeter through the three-way valve, while the materials in the product storage tank can enter the colorimeter through the three-way valve, thereby measuring the chromaticity of the materials in the product storage tank;

[0027] (5) allowing the product material from the intermediate product tank to enter the colorimeter through a three-way valve connected to the material inlet end of the colorimeter, and then flow to the stirring tank through another three-way valve connected to the material outlet end of the colorimeter to obtain the chromaticity of the intermediate product material;

[0028] (6) After 5-15 minutes (preferably 8-12 minutes), the product material in the intermediate product tank cannot pass through the three-way valve, and only the product material from the refining tower product tank enters the colorimeter through the three-way valve connected to the material inlet end of the colorimeter, and then flows to the stirring tank through another three-way valve connected to the material outlet end of the colorimeter to obtain the chromaticity of the qualified product material;

[0029] (7) Repeat steps (2) to (6).

[0030] In another preferred embodiment, the steps are performed automatically in sequence.

[0031] In a fourth aspect of the present invention, there is provided a method for online colorimetric analysis of chemical products using the analytical system provided by the present invention as described above, the method comprising the steps of: when manual operation allows the product material from the intermediate product tank to enter the colorimeter through the three-way valve connected to the material inlet end of the colorimeter, the three-way valve connected to the material outlet end of the colorimeter will simultaneously cut into the stirring tank.

[0032] Based on this, the present invention provides a colorimetric analysis and detection system with multiple flow paths and no mutual interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A colorimetric analysis system provided by the present invention is shown. DETAILED DESCRIPTION

[0034] After extensive and in-depth research, the inventor found that due to the different chromaticity of materials at each detection point, in order to prevent high-chromaticity materials from flowing back into low-chromaticity products, an automatic / manual control method of multiple three-way valves was proposed, so that the multi-channel colorimeter is equipped with a strict sequential logic control scheme, and an interlocking scheme is used to ensure that when the three-way automatic switching valve fails, the safe operation of the colorimetric analysis system process will not be affected. On this basis, the present invention was completed.

[0035] As used in the present invention, "refining tower product tank" refers to the product refining tower distillation outlet tank, which does not contain decolorizing agent and the color of the material contained therein either meets the color requirement or is between the color requirement and the color of the material in the intermediate product tank.

[0036] As used herein, "product tank" refers to a container containing material meeting colorimetric requirements.

[0037] As used herein, "intermediate product tank" or "intermediate tank" can be used interchangeably and refer to a container containing materials that do not meet color requirements or have high color and contain a decolorizing agent.

[0038] As used in the present invention, "mixing tank" or "decolorizing agent mixing tank" can be used interchangeably and refer to a container in which materials that do not meet the chromaticity requirements or have high chromaticity can be mixed and stirred with the decolorizing agent.

[0039] The "three-way valve" used in the present invention is commonly used in the art, that is, a valve body with three openings, and the three openings can be one in and two out or two in and one out.

[0040] The "colorimeter" used in the present invention is commonly used in the art, including but not limited to, an instrument that can measure the color and color difference reflected by an object (paper, etc.), measure ISO brightness (blue light whiteness R457) and the fluorescent whitening of fluorescent whitening materials, measure CIE whiteness (Ganz whiteness W10 and color cast value TW10), measure ceramic whiteness, measure the whiteness of building materials and non-metallic mineral products, measure Hunter system Lab and Hunter (Lab) whiteness, measure yellowness, measure the opacity, transparency, light scattering coefficient and light absorption coefficient of a sample, and measure the absorption value of ink. In one embodiment of the present invention, the colorimeter is an instrument for measuring the light absorption coefficient or light absorbance of a chemical product (material), such as, but not limited to, a platinum cobalt colorimeter for measuring styrene products.

[0041] The colorimetric analysis system provided by the present invention comprises at least three three-way valves, a colorimeter and some pipelines connecting the three-way valves, the colorimeter and the product tank (product storage tank and / or intermediate product tank). The colorimeter is between two three-way valves, and the other two openings of the three-way valve that can be connected to the material inflow end of the colorimeter through the pipeline are respectively connected to the product storage tank and the third three-way valve through the pipeline; the other two openings of the three-way valve that can be connected to the material outflow end of the colorimeter through the pipeline are respectively connected to the product storage tank and the stirring tank through the pipeline.

[0042] The other two openings of the third three-way valve can be connected to the intermediate tank through pipelines. In one embodiment of the present invention, there is a fourth three-way valve between the third three-way valve and the three-way valve that can be connected to the material inlet end of the colorimeter, and the three outlets of the fourth three-way valve are respectively connected to the product storage tank, the three-way valve connected to the material inlet end of the colorimeter, and the third three-way valve through pipelines.

[0043] The colorimetric analysis system provided by the present invention may have 1 to 5 intermediate product tanks.

[0044] The colorimetric analysis system provided by the present invention can fully automatically make multiple flow paths run in sequence, thereby measuring the colorimetric of materials from each flow path, including the steps of:

[0045] The first step is pipeline cleaning: the material in the intermediate product tank cannot enter the colorimeter through the three-way valve, but the material in the refining tower product tank can enter the colorimeter through the three-way valve, and then enter the stirring tank through the three-way valve connected to the outflow end of the colorimeter;

[0046] The second step is to measure the chromaticity of the material in the refining tower product tank: the three-way valve connected to the outflow end of the colorimeter is cut to the refining tower product tank, so that the material in the refining tower product tank passes through the three-way valve and enters the colorimeter, and then returns to or enters another refining tower product tank through the three-way valve connected to the outflow end of the colorimeter, thereby measuring the chromaticity of the material in the refining tower product tank;

[0047] The third step is to measure the chromaticity of the material in the product tank: the three-way valve connected to the outflow end of the colorimeter remains unchanged, so that the materials in the refining tower product tank and the intermediate product tank cannot enter the colorimeter through the three-way valve, while the materials in the product tank can enter the colorimeter through the three-way valve, so that the materials in the product tank enter the colorimeter through the three-way valve and then enter the refining tower product tank through the three-way valve connected to the outflow end of the colorimeter, thereby measuring the chromaticity of the material in the product tank;

[0048] Step 4: Colorimetric measurement of the intermediate product material: All three-way valves through which the material in the intermediate product tank can pass are tangentially directed toward the intermediate product tank, and at the same time, the three-way valve connected to the outflow end of the colorimeter is tangentially directed toward the stirring tank, thereby measuring the colorimetric value of the intermediate product material;

[0049] Step 5: Return to step 1 and proceed again.

[0050] In the first step above, the cleaning time can generally be set to 1-10 minutes, preferably 2-7 minutes.

[0051] The measurement in the second step can be performed for 5-15 hours, preferably 8-12 hours.

[0052] The measurement in the third step can be performed for 5-15 minutes, preferably 8-12 minutes.

[0053] The fourth step can be carried out for 5-15 minutes, preferably 8-12 minutes.

[0054] The colorimetric analysis system provided by the present invention can also measure the colorimetric of a specific flow path material through interlocking control, and the method comprises the steps of:

[0055] The first step is pipeline cleaning: put all three-way valves in manual mode; prevent the material in the intermediate product tank from entering the colorimeter through the three-way valve, but allow the material in the product storage tank to enter the colorimeter through the three-way valve, and then enter the mixing tank through the three-way valve connected to the outflow end of the colorimeter;

[0056] Step 2: Chroma measurement:

[0057] If the colorimetric measurement of the intermediate product material is to be performed, the three-way valves through which the material in the intermediate product tank can pass can be manually operated, and when these three-way valves are cut toward the intermediate product tank, the three-way valve connected to the outflow end of the colorimeter is cut toward the stirring tank at the same time through an interlocking action, thereby measuring the colorimetric measurement of the intermediate product material;

[0058] If the colorimetric measurement of qualified product materials is to be performed, the three-way valves that allow the materials in the intermediate product tank to pass through can be manually operated, and when these three-way valves are operated to allow only the materials in the product tank to pass through and enter the colorimeter, the three-way valve connected to the outflow end of the colorimeter is interlocked and simultaneously cuts to the product tank, thereby measuring the colorimetric measurement of the qualified product materials;

[0059] In the third step, if the second step is to measure the colorimetric of the intermediate product material, return to the first step for cleaning and then enter the second step; if the second step is to measure the colorimetric of the qualified product material, it can be maintained or switched to the colorimetric measurement of the intermediate product material according to the above second step.

[0060] In the first step above, the cleaning time can generally be set to 1-10 minutes, preferably 2-7 minutes.

[0061] The measurement in the second step can be arbitrarily selected according to needs, for example but not limited to, the colorimetric measurement of qualified product materials can be carried out for 5-15 hours, preferably 8-12 hours; the colorimetric measurement of intermediate product materials can be carried out for 5-15 minutes, preferably 8-12 minutes.

[0062] The main advantages of the present invention are:

[0063] 1. The colorimetric analysis system provided by the present invention can provide accurate and timely colorimetric data basis for process production in a timely manner, improve the product output of chemical products (such as styrene), and stabilize the quality of chemical products.

[0064] 2. The colorimetric analysis system provided by the present invention takes into account the high cost of purchasing a colorimeter and utilizes existing conditions to propose a technical solution of one meter for multiple uses.

[0065] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods for which specific conditions are not specified in the following examples are usually performed under conventional conditions or according to the conditions recommended by the manufacturer. Unless otherwise specified, all percentages, ratios, proportions, or parts are by weight. Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only.

[0066] Example 1

[0067] Chromatography Analysis System

[0068] See attached Figure 1 A multi-channel online colorimetric analysis system includes a colorimeter 15, pipeline 1, pipeline 2, pipeline 3, pipeline 4, pipeline 5, pipeline 6, pipeline 7, pipeline 8, pipeline 9, pipeline 10 and four three-way valves.

[0069] One end of pipeline 1 is connected to the refining tower product tank, and the other end is connected to the three-way valve 11; one end of pipeline 2 is connected to the product storage tank, and the other end is connected to the three-way valve 12; one end of the pipeline 3 is connected to the intermediate tank A, and the other end is connected to the three-way valve 13; one end of the pipeline 4 is connected to the intermediate tank B, and the other end is connected to the three-way valve 13; one end of pipeline 5 is connected to the decolorant stirring tank, and the other end is connected to the three-way valve 14; one end of pipeline 6 is connected to the refining tower product tank (which can be the same refining tower product tank connected to pipeline 1), and the other end is connected to the three-way valve 14; one end of pipeline 7 is connected to the three-way valve 11, and the other end is connected to the colorimeter 15; one end of pipeline 8 is connected to the three-way valve 11, and the other end is connected to the three-way valve 12; one end of pipeline 9 is connected to the colorimeter 15, and the other end is connected to the three-way valve 14; one end of pipeline 10 is connected to the three-way valve 12, and the other end is connected to the three-way valve 13.

[0070] Example 2

[0071] Colorimetric analysis system workflow (fully automatic control)

[0072] See attached Figure 1 The steps for all valves to operate in sequence are as follows:

[0073] (1) The three-way valve 13 points to the product intermediate tank A, the three-way valve 11 points to the refining tower product tank, the three-way valve 14 points to the decolorant stirring tank, and the colorimeter measures the color of the material from the refining tower product tank;

[0074] (2) After 5 minutes of pipeline cleaning, three-way valve 14 is cut to the refining tower product tank;

[0075] (3) After 10 hours (during which the color of the material in the refining tower product tank can be measured), three-way valve 11 is tangentially directed to the product tank, three-way valve 12 is tangentially directed to the product tank, and three-way valve 14 remains stationary, and the color of the material in the product tank is measured;

[0076] (4) Three-way valve 11 is tangential to the direction of product intermediate tank A, three-way valve 12 is tangential to the direction of intermediate tank A, and three-way valve 14 is directed to the decolorant stirring tank to measure the chromaticity of the material in product intermediate tank A;

[0077] (5) After 10 minutes, three-way valve 13 is turned toward product intermediate tank B, three-way valve 14 remains stationary, and the color of the material in product intermediate tank B is measured;

[0078] (6) After 10 minutes, three-way valve 13 is switched toward the product intermediate tank A, three-way valve 11 is switched toward the refining tower product tank, and three-way valve 14 remains stationary. The flow path switching is completed and the color of the material from the refining tower product tank is measured.

[0079] Return to step (2) and repeat.

[0080] Example 3

[0081] Colorimetric analysis system workflow (semi-automatic control)

[0082] See attached Figure 1 When the sequence control stops, the interlock control starts:

[0083] The four three-way valves 11, 12 and 13 are all in manual mode. At this time, the material from the product tank of the refining tower passes through the colorimeter and returns to the decolorant stirring tank. After 5 minutes of cleaning and replacement, the three-way valve 14 automatically cuts to the product tank of the refining tower.

[0084] To prevent misoperation, if the three-way valve 11 is turned toward the product intermediate tank, the three-way valve 14 will automatically turn toward the decolorant stirring tank at the same time. In this mode, the three-way valves 11, 12 and 13 can be manually operated, and the three-way valve 14 is interlocked.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the substantial technical content of the present invention. The substantial technical content of the present invention is broadly defined in the scope of the claims of the application. Any technical entity or method completed by others, if it is exactly the same as that defined in the scope of the claims of the application or an equivalent variation, will be deemed to be included in the scope of the claims.

Claims

1. A method for online colorimetric analysis of chemical products using a colorimetric analysis system, wherein the analysis system has components and pipelines, characterized in that: The components include a colorimeter and a three-way valve; the colorimeter is connected to the two three-way valves through pipelines, wherein an opening of one of the three-way valves is connected to a material inflow end of the colorimeter through a pipeline, and an opening of the other three-way valve is connected to a material outflow end of the colorimeter through a pipeline; The method comprises the steps of: (1) Allowing the material from the product tank of the refining tower to enter the colorimeter through a three-way valve connected to the material inlet of the colorimeter, and then flow to the stirring tank through another three-way valve connected to the material outlet of the colorimeter for 1-10 minutes; (2) another three-way valve connected to the material outflow end of the colorimeter is cut to the product tank of the refining tower; (3) Measure the chromaticity of the material in the refining tower product tank for 5-15 hours; (4) The three-way valve connected to the outflow end of the colorimeter remains unchanged, so that the materials in the refining tower product tank and the intermediate product tank cannot enter the colorimeter through the three-way valve, while the materials in the product storage tank can enter the colorimeter through the three-way valve, thereby measuring the chromaticity of the materials in the product storage tank; (5) allowing the product material from the intermediate product tank to enter the colorimeter through a three-way valve connected to the material inlet end of the colorimeter, and then flow to the stirring tank through another three-way valve connected to the material outlet end of the colorimeter to obtain the chromaticity of the intermediate product material; (6) After 5-15 minutes, the product material in the intermediate product tank cannot pass through the three-way valve, and only the product material from the refining tower product tank enters the colorimeter through the three-way valve connected to the material inlet end of the colorimeter, and then flows to the stirring tank through another three-way valve connected to the material outlet end of the colorimeter to obtain the chromaticity of the qualified product material; (7) Repeat steps (2) to (6).

2. The method according to claim 1, characterized in that The steps are performed automatically in sequence.

3. The method according to claim 1, characterized in that When the product material from the intermediate product tank is manually operated to enter the colorimeter through the three-way valve connected to the material inlet end of the colorimeter, the three-way valve connected to the material outlet end of the colorimeter will simultaneously cut into the stirring tank.

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