XU fully sealed vacuum filter provides filtration and purification solutions for the dye and pigment industry

1. Project Background and Industry Pain Points Analysis

In the production process of dyes and pigments, filtration, washing, and dehydration are key post-processing steps that determine the purity, yield, quality, and production cost of the final product. Traditional open or semi closed filtration equipment (such as plate and frame filter press, open drum filter press) in this field has exposed many serious problems that urgently need to be solved:

• Environmental pressure is enormous: The organic solvents used in the production process (such as alcohols, ketones, and benzene) or the irritating odors generated (such as acidic/alkaline gases) are highly volatile, leading to unorganized emissions of VOCs (volatile organic compounds), seriously polluting the environment, and cannot meet increasingly strict environmental regulations (such as the Air Pollution Prevention and Control Law)..

• Safety hazards are prominent: Many dye intermediates and organic solvents have flammable, explosive, and toxic properties.. The open operating environment greatly increases the risk of explosion and poses a threat to the health of operators, which does not comply with modern chemical safety production standards.

• Product quality and yield are unstable:

  • Solvent evaporation: causes changes in material ratios, affecting the consistency of key indicators such as product color and strength..

  • Foreign object intrusion: Dust and other impurities in the air may contaminate products, especially for high-end pigments and dyes..

  • Product loss: Toxic materials are prone to cross contamination in open environments, and the release of fine particulate dust directly leads to a decrease in product yield..

• High production costs: Precious solvents cannot be effectively recovered and are directly treated as waste gas, which not only increases raw material costs but also significantly increases the load and cost of end of pipe waste gas treatment..

2. Solution Core: Zhejiang Hexu Machinery XU Fully Sealed Vacuum Filter

2.1 Design Concept
Nuclear Xu Machinery XU Fully Sealed Vacuum Filter Adheres to  “ The entire process is sealed, inherently safe, and resource recycling;   The design concept is to solve the filtration problem in dye and pigment production from the root, completely locking the process in a leak free and non-volatile closed system.

2.2 Nuclear Xu Machinery XU Fully Sealed Vacuum FilterCore Technical Principles

• Fully enclosed structure: From feeding, filtering, multi-stage countercurrent washing, pressing/drying to unloading, all operating units are completed in a sealed chamber filled with inert gas (optional), achieving absolute physical isolation from the external environment..

• High efficiency vacuum separation: Using a vacuum pump to create a stable negative pressure environment inside the filter chamber as a filtering driving force, forcing liquid (mother liquor or washing liquid) to penetrate the filtering medium, and solid particles are intercepted to form a uniform, low moisture filter cake..

• Solvent and exhaust gas recovery system: All volatile solvents and gases generated during the filtration process are directed to thecondensation recovery systemand theexhaust gas treatment device (such as RTO, activated carbon adsorption).. The solvent can be condensed and recovered before being directly reused in the production process, achieving resource recycling; Non condensable exhaust gas is purified and discharged in compliance with standards.

2.3 System Process Flow Diagram

3. Core advantages of XU fully sealed vacuum filter solution

• 3.1 Intrinsic Safety and Environmental Compliance

  • Zero Leakage: Completely eliminate unorganized emissions of VOCs, meet the strictest environmental standards, and avoid high fines and production shutdown risks..

  • Explosion proof design: Inert gases such as nitrogen can be used for protection, completely eliminating the risk of combustion and explosion in the operating space.

  • Occupational Health: Create a safe and harmless working environment for operators..

• 3.2 Improving Product Quality and Yield

  • Stability: The sealed environment ensures a constant material ratio, and the consistency between product batches is extremely high..

  • High purity: Effectively prevents external pollution and deeply removes impurities (such as inorganic salts) through efficient multi-stage washing (hot water, solvent washing), improving product purity and added value.

  • High yield: Eliminating dust emissions and viscous material residues, significantly improving product yield..

• 3.3 Significant Economic Benefits

  • Solvent recovery: The highest solvent recovery rate can reach over 95%, directly and significantly reducing raw material costs..

  • Energy saving and consumption reduction: The low and uniform moisture content of the filter cake can reduce the energy consumption of subsequent drying processes by up to 20% -30%..

  • Reduce operating costs: Reduce environmental taxes, waste gas treatment fees, and insurance costs.. Automated operation reduces labor costs and human errors.

• 3.4 Automation and Intelligence

  • The entire system can achieve fully automatic PLC/DCS control, enabling one click start stop, online cleaning (CIP), fault diagnosis, and remote monitoring; Smart Factory” And“ Black light workshop; The key equipment.

4. Typical application scenario cases

• Scenario 1: Solvent refining of high-end organic pigments (phthalocyanine blue/green, azo series)

  • Material characteristics: Using strong solvents such as DMF and xylene, with high viscosity, pungent odor, and high product value..

  • XU Solution: Closed filtration and solvent washing throughout the entire process, with almost 100% recovery of solvent vapor. The workshop environment is odorless, and the purity of the recovered solvent meets the standard and can be directly reused, resulting in significant economic benefits.

• Scenario 2: Desalination and Dehydration of Water based Dyes (Reactive and Acid Dyes)

  • Material characteristics: Contains a large amount of inorganic salts such as sodium chloride and sodium chloride, and needs to be washed multiple times with high-temperature hot water..

  • XU Solution: Efficient hot water washing and vacuum dehydration are completed in a closed system. The resulting saturated salt mother liquor can be processed separately for crystallization, and the steam is condensed and recovered. The workshop environment is dry and clean, and the product salt content is controllable..

• Scenario 3: Filtration of high value-added dye intermediates (such as H-acid, para esters, etc.)

  • Material characteristics: It has strong acidity/alkalinity, strong corrosiveness, and contains irritating odor and toxicity..

  • XU Solution: The contact parts of the equipment are made of special anti-corrosion materials (such as Hastelloy and enamel), which completely seal and isolate toxic and harmful gases, protect equipment and personnel safety, and achieve clean production..

5. Investment Return Analysis

Taking an XU fully sealed filter machine for processing phthalocyanine blue pigment as an example:

Conclusion: This equipment is not only an environmental investment, but also a productive investment that can recover costs in the short term and continue to create profits.

6. Our Service Commitment

We provide services from; “ Process diagnosis - scheme design - experimental verification - equipment manufacturing - installation and commissioning - training and delivery - after-sales support;   Our one-stop service ensures that the solution perfectly fits your production process and achieves maximum value.

Summary

Today, as the chemical industry moves towards green, high-end, and intelligent manufacturing, Zhejiang Hexu MachineryXU Fully Sealed Vacuum Filter  Beyond the concept of a single device, it is a strategic solution that helps dye and pigment companies achieve safety upgrades, environmental compliance, quality improvements, and cost reduction and efficiency enhancement. Choosing us means choosing a trustworthy long-term partner to jointly create a new era of clean, efficient, and sustainable production.