Segmented Catalyst Bed for C9 Resin Hydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hydrogenation catalysts for C9 resin have poor catalytic efficiency, complex processes, and are prone to poisoning, leading to suboptimal product quality and increased production costs due to the need for multiple stages and different pressurization conditions.
Innovation Solution
A catalytic hydrogenation method using a Pt-W-Y/γ-Al2O3 catalyst in the first half of a fixed bed and a Pd-Zr-Nd/γ-Al2O3 catalyst in the second half, with hydrogen reduction, under specific temperature, pressure, and solubility conditions, to achieve simultaneous sulfur and halogen removal and deep hydrogenation, simplifying the process and enhancing catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal catalysts (Pd, Pt) are used for hydrogenation of C9 resin, then catalytic activity and product quality are improved, but the catalysts are easily poisoned by sulfur and other impurities
Solution Approach 1:
The catalyst system is segmented into multiple functional components: a noble metal catalyst (Pd or Pt) for hydrogenation and decolorization, combined with sulfur-resistant catalyst components (Ni-W, Ni-Mo, or Ni-Co) for hydrodesulfurization. This segmentation allows each component to perform its specialized function while working together in a single fixed bed reactor.
Solution Approach 2:
The invention uses composite catalyst materials that combine noble metal particles with sulfur-resistant metal sulfides or oxides on a common support. This composite structure enables the catalyst to simultaneously provide high hydrogenation activity from the noble metal while resisting sulfur poisoning through the sulfur-tolerant components.
2Reliability
If two-stage fixed bed hydrogenation is used with different catalysts, then sulfur removal and hydrogenation are improved, but the process complexity and pressure interference increase
Solution Approach 1:
The invention merges the functions of two separate fixed bed reactors into a single fixed bed reactor by combining sulfur-resistant catalyst and noble metal catalyst in one bed. This eliminates the need for separate reactors, reduces pressure interference between stages, and simplifies the overall process while maintaining effective sulfur removal and hydrogenation.
Solution Approach 2:
The combined catalyst system in the single fixed bed performs multiple functions simultaneously: hydrodesulfurization, hydrogenation of double bonds, and decolorization. This multi-functionality replaces the need for separate specialized reactors, reducing process complexity while achieving comprehensive resin treatment.
3Object-affected harmful factors
If non-noble metal catalysts (Ni/Al2O3, Ni-W, Ni-Mo) are used for hydrogenation, then sulfur resistance is improved, but catalytic activity and product quality deteriorate
Solution Approach 1:
The catalyst combines non-noble metal components (Ni-W, Ni-Mo, or Ni-Co) that provide sulfur resistance with noble metal particles (Pd or Pt) that provide high catalytic activity. The composite structure allows the non-noble metals to protect against sulfur poisoning while the noble metals drive the hydrogenation and decolorization reactions efficiently.
Solution Approach 2:
The catalyst is segmented into distinct functional phases: sulfur-resistant metal sulfide/oxide phases for protecting against poisoning, and noble metal phases for providing high activity. This segmentation allows each phase to optimize its specialized function while contributing to overall catalyst performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces the bromine number and Gardner chromaticity of C9 resin, improving its quality and extending catalyst life, while maintaining high activity and resistance to poisoning, thus enhancing production efficiency and cost-effectiveness.
Implementation Method 1
catalytic hydrogenation method using a Pt-W-Y/γ-Al2O3 catalyst in the first half of a fixed bed and a Pd-Zr-Nd/γ-Al2O3 catalyst in the second half
Implementation Method 2
hydrogenation catalysis of C9 resin saturates double bonds and some benzene in the resin
Implementation Method 3
remove sulfur in the raw resin
Implementation Method 4
removes residual halogens during the polymerization of the resin
Data Source
AI summary
The present invention discloses a catalytic hydrogenation method for carbon nine resin, comprising the following steps: 1) adding a Pt—W—Y/γ-Al2O3 catalyst in the first half of a fixed bed, adding a Pd—Zr—Nd/γ-Al2O3 catalyst in the second half of the fixed bed, and feeding hydrogen for reduction; and 2) catalytic hydrogenating the pretreated carbon nine resin in the fixed bed. In the present invention, different catalysts capable of reacting under the same catalytic conditions are added in the first and second halves of the fixed bed, and the two different catalysts play different roles, and can be active and complementary to each other under the same conditions. The synergistic effect of the two catalysts plays a good catalytic role. Moreover, the production process is simplified, and the production cost is saved.